If it was, it was a young one (first year). I also found a much bigger one which was definitely a bullfrog--the one in this picture could have been a green frog or leopard frog I guess--maybe even a wood frog. I didn't examine it long enough or closely enough to tell. I was trying to remember what frogs I've heard there last summer, and all I remember are bullfrogs.
In good light you'd see distinguishing characteristics. The locations of the mouth and eyes ares important, and they can have distinctive patterns on the skin and tail.
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http://www.trentu.ca/biology/berrill/IdentificationTable.htm