Stonejaw Strongjaw was Grog Strongjaw's father. As an NPC, he was played by Matthew Mercer.
When Kevdak beat Grog nearly to death, Stonejaw did nothing to help his son.
Stonejaw died at some point after Grog's departure from the Herd of Storms. His corpse was later reanimated by a dying mage who was attempting to become a lich, and Vox Machina destroyed him.