Gummit

A Gummit is an enemy appearing in Super Mario Galaxy 2. They only appear in the missions "The Chimp's Skating Challenge" in the Freezy Flake Galaxy and "The Chimp's Ultimate Skating Challenge" in the Shiverburn Galaxy‎. In said game, Gummits appear from holes in the icy floor, and Mario must skate over them to earn points. Gummits come in three varieties: green, which are worth 10 points each; gold, worth 50 points each; and spiky, which cause Mario to fall back and lose time.

Trivia

 * They slightly resemble the portrait ghost Jarvis from Luigi's Mansion.