Porcupuffer

Porcu-Puffers are enemies that appear in Super Mario World, where they follow Mario and Luigi in the water. The Mario Bros. can perform the Spin Jump on them to "ride" them, or use Yoshi. They resemble giant Cheep-Cheeps with blue spikes all over their backs. They appear in three levels, the secret level on top of the Vanilla Dome, and a secret area in the Cookie Mountain level. They also appear in a hidden area from Chocolate Island 1.

After a long hiatus, this enemy reappears in the game Super Mario Galaxy. However, only one appears, and it is in Drip Drop Galaxy. It's hidden in an underwater chest.

Porcu-Puffers are featured again in New Super Mario Bros. Wii. Here, they attack exactly the same as Spike Bass in the DS version, lying near the surface to pursue the plumber and his party or even leaping from the water to attack. Porcu-Puffers serve as obstacles for World 4, and they appear again in World 6 in level 6-5 and later in World 9 in level 9-2. They can only be defeated with a fireball, star or koopa shell. They can also be frozen, but they crack out almost instantly, much like a Spiny Cheep-Cheep.

Another appearance is in Super Mario Galaxy 2. Like the prequel, they are very rare. They only appear in Cosmic Cove Galaxy.

Porcu-Puffers later appear in Super Mario 3D Land, inhabiting underwater and beach levels. In World 6-1, Porcu-Puffers jump out of waterfalls, attempting to hurt Mario, and may even break some portions of the bridge he uses to reach the end of the level.

Porcu-Puffers also appear in Mario and Sonic at the London 2012 Olympic Games. During the Dream Rafting event, the second task a team is required to do is avoid them. They also appear during the Highway Tally game in London Party mode.

A similar species called Puffer-Cheeps appear in Mario & Luigi: Superstar Saga.

Trivia

 * Porcu-Puffer is a portmanteau of 'porcupine' and 'puffer' (puffer fish).