Flomp

Flimps are enemies that appear in Super Mario Galaxy 2. They are green platforms that have spikes on their sides, and have faces similar to Pushy Walls. They move from side to side, then suddenly, change their face from eyes closed, to eyes open with an angry face, then flip. If Mario or Luigi stands on a Flimp when they flip, they are thrown into the air. These are rare enemies, with 7 of them appearing in Bowser's Lava Lair, and 8 of them appearing in Grandmaster Galaxy.

Trivia

 * Flimp is a portmanteau of flip, referring to their attack, and Thwomp, one of their related enemies.