frog at night

I had a chance to explore a small pond around Aiken, South Carolina recently and found three species of frogs I can identify:

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Pine woods tree frog (Hyla fomerolis)[/caption]

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American bullfrog_ (Lithobates climitans)_[/caption]

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American Green tree frog (Hyla cinearea)[/caption]

There were numerous other frogs calling at night but I couldn’t find them.