You should be feeding froglets as much as they are willing to eat and dust crickets at every feeding. I like to keep babies in a smaller tank. For your guys I wouldn't go over a ten gallon tank. I would keep it simple with just one potted plant with a white paper towel on the floor. True pin heads can drown even when you just mist the tank so just keep the paper towel moist. Pour in about 20 crickets and they'll be easy to spot by the frogs on the white paper towel. In the morning when the frogs go back to the plant to sleep you can lift it out, change out the paper towel and clean up any dead crickets. Do that for about a month or so and then they'll be big enough to go into a larger tank. That way you know they're all eating. I also cover up three sides of the tank to make them feel secure.