i am guessing your chameleon is a veiled?
Vege and fruit that are good for him are:
Dandelion, Kale, Collard Green, thin slices of apples and oranges, a bit of carrots, and diced grapes.
Avoid brocolli, tomato, and spinach.
You don't exactly have to give him veggies and fruits.
But, the option is there if you want to.