Frostbite is a retired member of the Night Watchers.
As Frostbite proved himself over and over, he was allowed to chose his own name and allowed to take as long as he wanted. He took around two minutes to decide on the name Frostbite. Like Tigereye he chose his name because it sounded cool.
Frostbite was the second in command of the Night Watchers for a few months after its founding until the day he had to move. There are rumors of a reunion with Frost-bite when we can do some firework pranking.