As said already, chameleons are not carnivores, they are insectivores. A diet too high in animal proteins (from pinkies or dog/cat food gutload) leads to kidney failure and gout because they are not supposed to have them. Some veileds like to eat veggies (collard greens, mustard greens, etc.) so you could use those for variety. My guy loves his veggies and runs over to eat them almost immediately. Or you can try silkworms, hornworms, butterwrms, superworms, (not mealworms), dubia roaches, or mantises. All of those are good feeders for variety. Stick to bugs and greens!
You can find evidence of people feeding pinkies on the internet (of course, what can't you find on the internet?!), but who's to say they have any idea what they're doing at all? Their chams may die a few months afterward from everything else that's probably wrong with their husbandry practices too. Pinkies do not offer benefits, only risks. It's definitely not recommended.