In the video game The Lord of the Rings: War in the North, Tharzog was said to be chieftain of Mount Gram. The invaders were defeated by hobbits led by Bandobras Took, who personally slew Golfimbul. In TA 2747, they attacked the Shire and caused the Battle of Greenfields. Speculative location of Mount Gram shown on a map of the northern Misty Mountains They terrorized some inhabitants of eastern Eriador, including those of the Shire. The mountain was long inhabited by a group of goblins led by Golfimbul. Tolkien, it is often placed as part of the northern Misty Mountains, or in the Ettenmoors. Though its precise location was never identified by J.R.R.
Mount Gram was a mountain of Middle-earth, likely located in Eriador, known to be inhabited by Orcs.
Mount Gram as depicted in The Lord of the Rings Online