I think the size enclosure you are talking about may be a little tight for three frogs. Do NOT use gravel for a substrate! Accidental ingestion of gravel can lead to bowel impaction, which in turn leads to death. Better substrates are sphagnum moss, ground coconut shell (eco-earth), and white paper towels. These are much safer. Never use gravel for any reptile or amphibian unless the animal is totally aquatic.
Sometimes White's/northern green treefrogs have markings that can be used to identify an individual. You may get lucky and get three that all have some sort of personal markings that sets it apart from the others. My two are like that, one has white spots on its side, while the other does not.
I keep crickets on a substrate of Guinea pig pellets and I offer them sliced oranges and sometimes carrots. This provides them with food and moisture, while at the same time it provides more nutrition to your frogs. The frogs will end up eating what the crickets ate. I keep my crickets in a short trash bin, as I buy them by the thousands. You can use a smaller enclosure. Remember to keep what ever bin you use covered as they can jump. Also do not let it get to humid in your cricket bin or they will die off on you.





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