Spiked Fun Guy (Super Mario World 2: Yoshi's Island)

Spiked Fun Guy is a small, green type of Pokey in Super Mario World 2: Yoshi's Island and its remake Yoshi's Island: Super Mario Advance 3, they inhabit a handful of stages. Ordinarily, they merely move back and forth along the ground, bouncing back when they collide with a wall. As they move, they rapidly contract their heads up and down. A bouncing version in a pot also exists.

Super Mario World 2: Yoshi's Island

 * Official Nintendo Player's Guide: A fun guy? Oh, really. A couple of jokes from this party animal and everyone will be snoozing.

Yoshi's Island: Super Mario Advance 3

 * Shogakukan guide: 小さくてもサボテン. ふむとイタい目にあうぞ！風船にぶら下がって出てきたり、鉢に乗って出てくることもある. (A rather small cactus. You'll be sorry if you step on it! It sometimes hangs from a balloon or rides in a pot.)