Hoppycat

Hoppycats are green, spiky-shelled creatures resembling snails that appear in Super Mario Bros. Wonder. Similar to Spiny Skipsqueaks in Super Mario Maker 2, they attack by jumping when the player(s) also jump. There is also a red log-like lift that shoots out a Hoppycat from the side whenever the player jumps while riding it, which can be used to hit blocks. Their name is a portmanteau of "hop" and "copycat". One Wonder Effect turns the characters into Hoppycats, though this form is shown to have four spikes instead of three.