From the Super Mario Wiki
Three Green Gummits along with a Spiky Gummit.
A Gummit is an enemy appearing in Super Mario Galaxy 2. They appear only 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 both missions, Gummits appear from small holes in the icy floor, and Mario or Luigi must skate over them (thereby knocking them out of their holes) to earn points.
Gummits come in three varieties: Green Gummits - which are worth ten points each, Gold Gummits - worth fifty, Spiky Gummits - which cause Mario or Luigi to fall backward and lose time. Unlike other enemies, Gummits can be bumped into without taking any damage.
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