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Hyla versicolor
There is absolutely no way you can positively identify this as a gray tree frog based on this photo. This frog is in range for both gray and cope's gray tree frogs (Hyla versicolor and Hyla chrysoscelis), and they are both highly variable and visually indistinguishable from each other. Only way to tell them apart is by call and by chromosome count. Please edit your spotting to reflect this, thank you.