1/2" long Brown with greenish background on back. Also seems to have 4 light brown "tear drops" on it's back, with the small points, pointing toward each other. Sorry for poor quality pics, but best of 20+ that I took with iPhone 4...
On ground in mixed Forrest at Cushing Park in Canton, Ga 30114.
Large pic of frogs back can be expanded to show "tear drop" pattern on back.