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This little one looked maybe four or five inches long and looked like they had risen right out of the sand (although I didn't actually see that happen!) There may be no way to tell the species for the sand on their back, but I can see some spotting on the lower leg, at least.
In the waters/on the shoreline of the Arkansas river as the sun was going down. It was hot and humid, and the water was warm.
My guess when first looking around was maybe a lightly colored Acris crepitans, but I'm really inexperienced with frogs and toads. Seems like a lot of them vary in pattern/color and we have a lot in AR.