Rhomp

Rhomps are a rolling species of Thwomp-like enemies that first appeared in Super Mario Galaxy 2. Only 18 are found in the entire game, all being found in the sand slide area of the Slipsand Galaxy. Here they attempt to flatten Mario, which kills him instantly. They resemble tube-shaped stones with smiley faces and a circular stone with square designs on it attached to each side. They are similar to Spindels in both design and behavior, but have several differentiating features, such as smooth stone skin and no teeth or eyebrows. A Rhomp's face is very similar to that of a Grumblump.