Length 2 1/4 – 3 1/2 in. (6-9 cm). This is by far the most abundant and widely distributed frog in Ohio. Although similar in appearance to the American Bullfrog, the Green Frog is smaller and has two very pronounced ridges or dorsolateral folds down the back which are not found on Bullfrogs. The Green Frog does not start singing until long after most other frogs have finished breeding. Its call sounds like the plucking of a bass string on a banjo at well-spaced intervals. When disturbed, this frog utters 38 a short, high pitched cry as it dives into the water. Even as an adult, the Green Frog is very aquatic and stays near water season after season. The tadpoles closely resemble Bullfrog tadpoles, but are smaller. Green Frog tadpoles metamorphose the same year if they hatch frog eggs laid in May or June. Eggs laid later result in tadpoles that overwinter, then undergo metamorphosis the next spring or summer.
Text courtesy of the Ohio Division of Wildlife: https://wildlife.ohiodnr.gov/portals/wildlife/pdfs/publications/id%20guides/pub348.pdf