This chameleon is probably a dude! Sometimes female chameleons develop spurs at birth, but another way to tell is to see if they have a genital bulge, and it looks like your cham has one. I would advise you to check where the tail meets the body to see if you can see a bulge. If you can't find any hint of a bulge then your cham is female, if you find even a little bulge, your cham is male.