The urgonox was a creature native to Clak'dor VII. It was the mutated descendant of the urgrinox.
Sources
Creature Feature: The Sarlacc of Aargonar on Wizards.com (original site is defunct)
The urgonox was a creature native to Clak'dor VII. It was the mutated descendant of the urgrinox.
Creature Feature: The Sarlacc of Aargonar on Wizards.com (original site is defunct)