That's a good idea and his metabolism must be good for that going that frequency. At the size of the frog it would be best to feed it daily.

If the store is limited then your best bet it to order them online. I don't bother with pet shops and get them online. The ones in stock here are never the right sizes I want. If you keep them warm 77F+ they will grow fast, though. Remember to dust with a supplement that contains all round vitamins-not just D. Preformed vitamin A is important for frogs.