Why would you want to put another frog in?
Fist off, most amphibians should not be housed with other species, especially in a tank as small as a ten gallon.

Second, since the frog you found in your backyard is wc it could have all sorts of pathogens, in which case you should quarentine it from other frogs to make sure it adapts well.

Before you get any more frogs you need to find out how to care for the ones you already have.

Email me at otis07_@hotmail.com if you have any more questions about mixing.
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A room of herps.
www.freewebs.com/kapoktree