Occasional mealies are okay, like a treat. I let me frogs have a couple of mealies twice a month. Usually when I'm running a day behind picking up crickets and do not want them to miss their routine feeding. Crickets and earthworms will be just fine though. My toads devoured earthworms, they'd get so excited seeing them! That was one thing I loved about them, they were almost like puppies, such enthusiasm.