Spike

Super Mario Bros. 3
Spikes are enemies that appeared first in Super Mario Bros. 3. They were found in the Water Land and Iced Land stages, and attack by pulling spiked balls out of their stomachs and throwing them at Mario or Luigi; like Lakitus, they have unlimited amounts of ammo. Also, Spikes' stomachs can be used to store other things as well.

Super Mario Momotarō
In Super Mario Momotarō, a Spike appears alongside a Parabeetle and a Boomerang Bro. as allies of Mario, aiding him in defeating Bowser and rescuing Princess Peach.

Super Mario World 2: Yoshi's Island
Spikes later reappear in Super Mario World 2: Yoshi's Island. Instead of pulling spiked balls from their stomachs, they shoot huge ones twice their size. They only are in BLIZZARD!!!, but in the remake, they also appear in Endless World of Yoshis. They are erroneously named "Mace Penguins."

Yoshi's Story
Spikes reappeared in Yoshi's Story in the level Jungle Hut on Page 4. They regurgitate spiked balls and roll them down hills. The Yoshis may eat them, but the Green Yoshi likes them best. They are mistakenly known as "Gabons", probably a translation error.

According to the text seen after beating the level, the Baby Yoshis apparently met one specific Spike named "Gabon" while entering his hut. All that is known about the encounter is that the angered Spike threw various objects at the Baby Yoshis.

Super Princess Peach
Spikes also appear in Super Princess Peach, which also introduces the orange haired, enraged Mad Spike.

New Super Mario Bros.
An icy variety of Spike called Snow Spike also appears in New Super Mario Bros. and instead of spiked balls, they throw snowballs that get progressively get bigger.

New Super Mario Bros. Wii
Normal Spikes also reappear in New Super Mario Bros. Wii, along with a blue variety that throw spikeballs made out of rock. Spikes can be defeated by a simple jump to the head, although it may be unsafe because the Spike may pull out a spikeball, which will cause the player damage if he/she lands on top of it. Luckily, there are usually Barrels nearby that can be thrown at it, although good timing is needed as the spikeballs will destroy the barrel. They can also be defeated by fireballs and can also be frozen via Ice Flower or Penguin Suit.

Appearances
Some are green while others (ones that inhabit cold places) are white. Clubbas closely resemble Spikes, which differ in that they are bigger than Spikes, and instead of producing spiked balls, Clubbas wield them on their maces. The Japanese names of Spikes and Clubbas, Gabon and Gabon Hei respectively, imply that they are directly related. Additionally, the character Tolstar (found in Mario & Luigi: Superstar Saga) may be the Beanbean Kingdom version of Spike.

Trivia

 * Huckit Crabs behave very similiary to Spikes.