My Yemen Chameleon loves locusts, mealworms and waxworms. Most will eat crickets too but mine is a fussy so and so and spits them out! lol
Mine also loves greens ie: spring greens/dandelion leaves/rocket. and some Cham's will eat small amounts of fruit and veg (finely chopped or grated). There are websites that can tell you which are safe for them, such as: What Fruits & Vegetables Can Chameleons Eat? | eHow.com
I only keep one, but from what the breeder told us they are best kept on their own.
Good luck with your Chameleons!