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@Chase ...maybe you'll like this...
And this mentions T. goetzei too..."Species of the genera Bradypodion and Chamaeleo, as well as Trioceros goetzei, all possess a single gular pouch (morph one) formed from ventral expansion of soft tissue where the larynx and trachea meet"...
https://www.researchgate.net/publication/337009383_Gular_pouch_diversity_in_the_Chamaeleonidae