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Hyla versicolor
You can't call this a Gray Tree Frog. The Gray Tree Frog and the Cope's Gray Tree Frog are visually impossible to tell apart, and they are both in range. So it could be either one, and there is no way to tell. So a proper ID would be Gray/Cope's Gray Tree Frog, with the scientific name being Hyla versicolor/chrysoscelis.