I'd say, "Well, if his eyes pop out of his head..." but we're talking about a chameleon—how would you know?
If you play bass, you probably know a little about frequencies.
Like snakes, chameleons do not have an outer or a middle ear, so there is neither an ear-opening nor an eardrum. However, chameleons are not deaf: they candetect sound frequencies in the range of 200–600 Hz. https://en.wikipedia.org/wiki/Chameleon