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Lithobates clamitans
Green Frogs can actually have a vast amount of colorations! I have seen a lot with varying greens, browns, and yellows. Many have spots, some have none! I've even seen pictures of blue-colored green frogs!
This is a green frog. See those ridges extending along its back from both of its eyes? Those are called dorsolateral folds. Green frogs have them, bullfrogs do not.
How odd it's body is exactly half brown half green. I agree either green frog or bull frog