In Norse mythology, Tanngrisnir (Old Norse “teeth-barer, snarler”) and Tanngnjóstr (Old Norse “teeth grinder”) are goats harnessed to the chariot of the god Thor.
Tanngrisnir and Tanngnjóstr had some amazing properties. When Thor was hungry, he could kill them and eat their meat, leaving skin and bones behind. The next day he resurrected them with his hammer.
Thor once stayed overnight at a peasant house in the countryside and shared his goat food with them. One of their children, Þjálfi, broke one of the bones to suck the marrow, which caused one of the goats to lame after the resurrection. Thor made Þjálfi and his sisters Röskva his servants as punishment.