My younger sister has 3 gray tree froglets. One of them is really fat, one looks really skinny, and the other looks normal. I'm wondering if the fat one is normal. He looks too big in my opinion, but I'm no expert. I don't know if he is just over eating, or if there is something else wrong with him. I do know that a couple weeks ago my sister dropped the fruit fly container in the tank, causing a lot of them to escape into the tank. I don't know if that was how he got so big. Is it normal for these guys to get so big at only two months old?

Here are some pics of all of them:

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