GraGoh is the urSkek identity of skekGra and urGoh before the Great Division, when they were split into two separate beings.
In The Dark Crystal: Age of Resistance, skekGra and UrGoh created a puppet of their original urSkek form. It was featured in a puppet show explaining the origins of the Skeksis and Mystics to Rian, Brea, Deethra and Hup at the Circle of the Suns.