Hop-Chops

Hop-Chops are uncommon enemies that appear in Super Mario 3D World and Super Mario Maker 2. They are sentient green springboards with a square head, red eyes, and sharp teeth. These enemies usually appear in groups of three or more, and reside in areas where a springboard is required to obtain a collectible, such as a Green Star.

Super Mario 3D World
Hops-Chops debut in Super Mario 3D World, and are usually found in groups. When players approach a Hop-Chops, it will begin to bounce toward them. Hop-Chops can be defeated by any attack. Defeating a Hop-Chops sometimes turns it into a Springboard which the player can carry and use. Usually, one Hop-Chops per group can turn into a springboard. If left as a springboard for too long, a Hop-Chops will turn back into an enemy. This can also happen while it is carried.

Super Mario Maker 2
Hop-Chops reappear as enemies that can be placed in Super Mario Maker 2 stages, exclusively in the Super Mario 3D World style. In this game, they no longer are defeated when jumped on, instead acting like Trampolines initially.