Flomp

Flomps (also called floating plates or flipping panels ) are Thwomp-like creatures appearing in Super Mario Galaxy 2. Their name is a portmanteau of "flip" and "Thwomp," alluding to their behavior and appearance. They appear as green platforms with spikes on their sides and have similar faces to Bomps.

Super Mario Galaxy 2
For the most part, Flomps act as ordinary platforms, with some revolving mildly in one spot and others moving from side to side. However, at set intervals, they make a rattling sound, their faces become angry, and then they quickly flip over. If Mario or Luigi is on one of these platforms when they flip, he will be knocked high into the air. They appear only in Bowser's Lava Lair and the Grandmaster Galaxy.

Mario Party: Island Tour
Flomps make a reappearance in Mario Party: Island Tour, acting and looking like they did in Super Mario Galaxy 2. They appear in the minigame Flip Out, where players must use them as well as regular platforms to cross a chasm to the finish line; characters that stay on a Flomp as it flips are flung three spaces backwards.