Cobra: The reason for not feeding mealworms and superworms isn't the nutritional value, it's the impaction-causing chitin in their exoskeletons. Also, what is the source of the information that insects lose nutritional value as they age assuming you continue to gutload them? I have never heard anything like that before. Not to disparage the vet techs you work with, but vet techs are not experts (in other words I've heard some completely unfounded things from vet techs before; I'd prefer to see some sort of scientific literature or a rec. from an actual vet).

Emily: One or two mealworms probably won't hurt your frog but if he'll take other foods it's best to avoid them completely. Better safe than sorry IMO. If you follow Cory's advice you should be able to get him hunting the crickets.