Cath, take a look at the pictures linked below.
The first two are of bulllfrogs. Notice the line that goes around it's eye and tympanium and stops.

In the last link there are pictures of green frogs. Here you will see that the line runs down it's back on both sides of it's body.
"Horton"

http://animaldiversity.ummz.umich.edu/site/resources/james_harding/pcd3912_106.jpg/view.html

http://www.uri.edu/cels/nrs/paton/LH_bullfrog.html

http://www.npwrc.usgs.gov/resource/herps/amphibid/species/bronze.htm

Thanks Horton,
I knew that it didn't look like my usual green frogs, but I wasn't sure if it might be a different frog (other than a bullfrog).
It has those dark specks on it and that really big "chin/neck".
It doesn't have any lines down its back, but I just don't know if its some other frog.