Sir Frosties are enemies from The Legend of Zelda: Spirit Tracks.
Sir Frosties are found in the Snow Realm as overworld enemies that trying to destroy Link's train. These snowman attack by decapitating themselves and throwing their heads at the train. The head can be shot with the Cannon to be avoided. Their heads will regenerate if the body is not destroyed and they'll continue the assault. If Sir Frosties has its head on, it will take two hits to kill, but only one without it.
- Sir Frosty's name possibly came from the popular song and TV program, Frosty the Snowman.