They're not that much harder then fish are to keep, but they can be messy eaters so usually you have to clean the tank more often with them then you would with fish. They live completly in the water, but you have to be careful because if they can they will escape from the tank and since they are fully aquatic, they can die if out of water for to long.
But if there are other fish in your son's tank, then don't put an african clawed frog in there because they looooove to eat and will eat all the other fish/dwarf frogs if they catch them. I would only ever keep a clawed frog in a tank on it's own, or with other clawed frogs that are the same size.
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