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Hyla chrysoscelis
Tree frog with cross marking on its back
Back yard
It could also be a Hyla avivoca, it is hard to tell for certain from the photo without looking at the underside of its hind legs. If the legs are bright orange or yellow it is definately Cope's Grey Treefrog, if they are green or yellowish white then it is most likely a Hyla avivoca - Bird-voiced Treefrog.