I am pretty sure they are Grey Tree Frogs, after the research I did on the adults we found on our pool cover back in May. The brand of water I am using is Crystal Geyser, which says it is a natural Alpine sring water. Is that ok for them?

Also here is the pictures you asked for:
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The first three pictures are of the froglets and the last picture is of one of the adult frogs we found in our pool.