Nipper Plant

Nipper Plants, also known as Walking Piranhas (also misspelled as Walking Piranas ), White Piranhas, and Baby Piranha Plants, are small Piranha Plants. They have white heads and short green stems with two leaves on either side. In the Yoshi's Island games, they are produced from Nipper Spores.

Super Mario Bros. 3
They first appear in Super Mario Bros. 3, where they would either patrol an area or wait in place, with both jumping up towards the player when they pass over them. Walking Piranhas can hop around, making it more difficult for the player to land safely, since the plants will harm the player if they attempt to stomp on one. Instead, Walking Piranhas can be defeated by Invincibility, Fire Mario and Fire Luigi's fireballs, Hammer Mario and Hammer Luigi's hammers, Raccoon Mario and Raccoon Luigi's tail attack and Tanooki Mario and Tanooki Luigi's transformation. In subsequent remakes, they were re-colored pink rather than the usual white. In all versions, a jumping Walking Piranha is a recolor of two Muncher frames.

A sessile, fire-breathing variety is encountered at the end of World 7-8, and is the only one in the entirety of the game.

The Adventures of Super Mario Bros. 3
Nipper Plants make a few appearances in The Adventures of Super Mario Bros. 3. In these appearances, they behave much like their game counterparts in that they are capable of hopping around. On the show, Nipper Plants sport visible jaws that make them appear to be more menacing than their in-game counterparts.

In "Reign Storm", Mario intends to send via Warp Pipe a letter to Princess Toadstool, in which he prompts her to return to the Mushroom Kingdom. However, a Nipper Plant that was taking shelter inside the Warp Pipe intercepts and eats Mario's letter. The Nipper Plant then travels to King Koopa to inform him about the letter's content.

In "A Toadally Magical Adventure", Cheatsy Koopa uses a Magic Wand to increase a Nipper Plant's size and sends it to attack Mario. However, the plant lunges at the pipe creature that was having Mario in its grip, accidentally releasing Mario. Of note is that Cheatsy only refers to the Nipper Plant as "Piranha Plant".

Super Mario Bros. Print World
Artwork of Nipper Plants appears in Super Mario Bros. Print World, but they are incorrectly labeled as Munchers, the similar, but black-colored enemy from Super Mario Bros. 3 (which the poses of the artwork are borrowed from). There is additional artwork of Mario jumping over a Nipper Plant, labeled as "Mario 1".

Nintendo Adventure Books
Wendy O. Koopa is revealed to have a pet Nipper Plant, which she keeps in a pot in her room, in Koopa Capers; the plant had shredded a note possibly pertaining to her whereabouts. If Luigi chooses to begin his search for the missing Koopaling by looking through her room, he accidentally wakes up the sleeping Nipper Plant when he tries to look under it. Some wild Nipper Plants later appear prowling the stairs leading up to the secret camp being used by Wendy and her rebellion.

Yoshi franchise
In Super Mario World 2: Yoshi's Island and its remake Yoshi's Island: Super Mario Advance 3, Nipper Plants do not jump at the player and are much easier to defeat, but they appear in groups which adds to the challenge of defeating them. They hatch from Nipper Spores that slowly fall to earth and have no visible eyes. These Nipper Plants can be stomped or eaten and turned into eggs; their spores can also be swallowed, though no eggs will be produced as a result.

Nipper Plants and their spores reappear in Yoshi's Story, Yoshi's Island DS and Yoshi's New Island.

Nipper Plants reappear in Yoshi's Woolly World and Poochy & Yoshi's Woolly World, acting the same as in previous games.

Nipper Plants also reappear in Yoshi's Crafted World, once again acting the same as in previous games.

Super Mario RPG: Legend of the Seven Stars
In Super Mario RPG: Legend of the Seven Stars, Nipper Plants, under the name Chompweed (also parsed as chompweed) appear in the Pipe Vault, and cannot be battled. Rather than fighting the player, they jump up and steal a few coins if they get too close. Stolen coins can not be recovered in the final game, but battle data for them still exists, suggesting that they may have been intended to be standard enemies at one point. Another potential artifact of this is them being among the enemies that can be thrown in the Chomp attack. Aside from this, it also was one of the incorrect answers to Dr. Topper's quiz section in the final level, specifically for "What's the first monster you see in the Pipe Vault?" (This answer only exists in the English version; in the Japanese version, it was instead a reference to from ).

Game & Watch Gallery series
In Game & Watch Gallery 3 and Game & Watch Gallery 4, Baby Piranha Plants appear in the modern versions of Donkey Kong Jr. (Game & Watch).

Super Princess Peach
Nipper Plants reappear in Super Princess Peach, where they are identical to the ones that appeared in Super Mario World 2: Yoshi's Island. A Gloom vibe-infused variety known as Sad N. Plants also appear in this game.

Mario Kart Arcade GP
Some Nipper Plants make a cameo appearance in Mario Kart Arcade GP in the course Bananan Ruins. They are at the right side of the course. They also appear in the course Castle Wall.

Mario & Luigi: Dream Team
Nipper Plants appear as background enemies in Mario & Luigi: Dream Team. In battle, a Piranha Plant may spit out Nipper Spores into the background, each one instantly becoming a Nipper Plant. Once created, they shoot fireballs at Mario individually, which he must deflect with his hammer to avoid taking damage and to also randomly hit the Piranha Plants in the process.

Occasionally, a Piranha Plant will spit a fireball towards the Nipper Plant, who will bounce the fireball about until each Nipper Plant has touched the fireball at some point, where the last Nipper Plant to touch it sends the fireball towards Mario, who must hammer it back at the Piranha Plant who created it to counter-attack and avoid taking damage. The Nipper Plants are defeated when the Piranha Plant that spawned them is defeated. They can also be defeated by throwing a Taunt Ball at them.

Mario Tennis Aces
In Mario Tennis Aces, two Nipper Plants can be seen bouncing in the background of Petey Piranha's battle in the Forest Monster mission.

Super Smash Bros. Ultimate
A Nipper Plant appears in Super Smash Bros. Ultimate as a Novice-class Grab-type primary spirit. It can be enhanced to a Petey Piranha spirit at level 99. The Nipper Plant spirit battle takes place on the Battlefield form of the Super Mario Maker stage and involves eight tiny Pac-Men. To earn the spirit, the player either has to win this battle by defeating all opponents or purchase it from Beedle's Tent for 500 Spirit Points at regular price.

On the Palutena's Temple stage, Nipper Plants are mentioned briefly by Viridi during Palutena's Guidance dialogue for Piranha Plant.

Paper Mario: The Origami King
Nipper Plants appear as enemies in Paper Mario: The Origami King. Nipper Plants are mentioned to spit fire in the Musée Champignon description for them, although they do not actually spit fire. In battle, Nipper Plants face either straight or upwards, and attack by biting Mario either solo or with a barrage of bites. If Nipper Plants are facing upwards, they cannot be jumped on without a type of Iron Boots.

Super Mario World 2: Yoshi's Island

 * Official Nintendo Player's Guide: Hatched when Nipper Spores touch ground, these hopping choppers make excellent eggs.

Yoshi's Story

 * Shogakukan guide: うっかりぶってしまいがち. 足元には気をつかて. (It's easy to accidentally bump into them. Watch your step.)
 * Nintendo 64 Spieleberater: Mit den scharfen Beißerchen sind sie ganz schön gefährlich. Also fress' ich sie immer sofort! (With their sharp bite they are quite dangerous. So I always eat them immediately!)

Trivia

 * In the Super Mario Mash-up in Minecraft, Peonies are replaced by a group of Nipper Plants.
 * A 2017 interview reveals that Nipper Plants were going to appear in Super Mario World, as shown in a prototype sprite sheet.