Frogs only see movement, so pre killed prey is unfortunately out of the question. Another option (if your parents will let you) is to culture your own dubias. Dubias are one of the best feeders available, much more nutritious. But, because they are a roach most people get turned off very quickly. These are a tropical species so there is no chance of them invading your home. There are numerous guides on breeding them, it is really simple, though it can be sorta costly initially. On Beardeddragon.org there is a guy (Username is critterfeeders) who sells dubias cheap. Usually 300 shipped is about 45 bucks, plus 15 for a tub/heat mat and boom you have a dubia colony. Good luck!