Tanngrisnir (Old Norse "teeth-barer, snarler") and Tanngnjóstr (Old Norse "teeth grinder") are the goats who pull the god Thor's chariot in Norse mythology.
According to the stories when Thor cooks the goats, their flesh provides sustenance for the god, and, after Thor resurrects them with his hammer, Mjölnir, they are brought back to life the next day.
In one tale accounting the power of the goats, Thor alongside Loki stop at the home of a peasant farmer, and there they are given lodging for a night. Thor slaughters his goats, skins them and puts them in a pot. When the goats are cooked, Loki and Thor sit down for their evening meal. Thor invites the peasant family to share the meal with him and they do so.
At the end of the meal, Thor places the skins of the goat on the opposing side of the fire and tells the peasants to throw the bones of the goats on to the goatskins. The peasant's son Þjálfi takes one of the goat ham-bones and uses a knife to split it open, breaking the bone to get to the marrow.
After staying the night, Thor wakes up and gets dressed before the break of dawn. Thor takes his hammer Mjöllnir, raises it, and blesses the goat skins. Resurrected, the goats stand, but one of the two goats is lame in the hind leg. Noting this new lameness, Thor exclaims that someone has mistreated the bones of his goats; that someone broke the ham-bone during the meal the night before.