The subject of this article originates from non-canonical sources. To find out about what is considered "canon" see LOTR:Canon.
Nos Grimsong was a male Longbeard dwarf residing in Thorin's Halls sometime before the War of the Ring. He was assigned by Dwalin to speak with the elvish party that had arrived in the settlement. He joined Dwalin's group to Skorgrim's tomb in order to stop Gormr Doursmith from resurrecting the ancient King.