The Frost Giant is a giant hostile creature, it is afraid of fire. They will follow you if you wear a Viking Helmet. In remix, the frost giant is vulnerable to heat, such as a magnifying glass.
One of the Frost Giant's synonyms, Ymir, comes from the character from Norse mythology, father of the race of frost giants. The other two, Bolthor and Bolthorn, come from another Norse mythological character, grandfather of Odin.