If your chameleon will eat crickets, you are doing him a favor by feeding them to him. They are the ideal feeder, being low fat, and easily gutloaded. Most of the worms cannot be gutloaded other than the supers. Most of the worms are fatty also. Most people feed worms in addition to the crickets which they use as a staple feeder. Some people feed worms because their chameleons will not eat crickets after they get a taste of the worms. If your chameleon is willing to eat the crickets, then I suggest feeding those and mixing the worms into the diet here and there. just my opinion here.