Brrr Bit

From the Super Mario Wiki

Brrr Bits are enemies in Super Mario Galaxy, and are the icy counterparts of Burn Bits. To defeat one, Mario must use a Star Spin to put out the ice cloud surrounding it, and it will fall to the ground stunned just like any other enemy. If the player is not quick to hit the Brrr Bit while it is vulnerable, it will start to hop around, attempting to jump in the icy water and regenerate its ice cloud.

In their icy state, Brrr Bits resemble Embers with white eyes.

Ice Creatures
Abominable Snowkoopa | Baron Brrr | Beldam | Bleak | Blizzaurus | Bonechill | Brrr Bit | Chief Chilly | Chill Bully | Crystal Bit | Crystal King | Dr. Freezegood | Flaky | Flurry | Freezie | Frost Piranha | Headless Snowman | Ice Elemental Ghost | Ice Puff | Ice Spiny | Jojora | Jojora's Friends | Mr. Blizzard | Penguin | Penguin (WL) | Topi