Rhomp

Rhomps are a rolling species of Thwomp that first appeared in Super Mario Galaxy 2. They are only found in certain areas of the Slipsand Galaxy, where they attempt to flatten Mario, instantly depleting his health. They resemble tube-shaped stones with smiley faces and a circular stone with square designs on it attached to each side.

Trivia

 * The behavior and appearance of Rhomps make them resemble the mummy-like Spindels from Super Mario 64. They even possess the same attack pattern.