Can you try to get a photo where the chameleon is centered and in focus, and preferably pictured from the side? The photo you uploaded isn't clear enough to make a definitive identification.
Much better, thanks! Based on the shape of the casque and cranial crests, the gular and dorsal crests, and the gular grooves, it looks like you have a very healthy young adult Elliot's Chameleon (Trioceros ellioti).