Yes you can feed small superworms to a small chameleon. also small butterworms, small silkworms, small roaches....
If you choose to use soldier fly maggots (pheonix worms) you should use a needle/pin to poke a hole in them just before offering. Otherwise they can pass through undigested.
Just going by your avatar its hard to know how old it is, but I feed young ones as much as they can eat within about 5 minutes, several times a day. around the 6 month mark (depends on the animal, how fast it is growing) Im only feeding twice a day and Im starting to count out bugs rather than going by what they eat in a given amount of time. At about a year old, and thereafter, Im feeding approx 1-3 bugs per day.