Chameleons don't have ears and I have read several sources that state they are generally considered deaf. Although they may respond to very low frequencies, the human voice at 1khz is most likely too high. So if you have a good voice or not your chameleon won't mind if you sing :)
For kids it's hard to beat leopard geckos and bearded dragons. Leopard geckos are beautiful and slightly easier to take care of then beardies as they don't need as high temperatures, UVB or salad.
Although I usually can't find mine in their enclosures the book "Chameleons" noted C.J. Raxworthy's observation that panther chameleon "while occasionally climbing to moderate heights of 20 ft. or so, it is very abundant in small shrubs, bushes and weeds less than 6 ft."
I'm sorry, I...