It doesn't look like a cuban to me. Cubans have much larger front toe pads and do not have the striped pattern on the legs. Here's a good site from UF that provides photos and info on all Florida frogs: http://www.wec.ufl.edu/extension/wil...a_gratiosa.php
Based on the pattern and the size, I'd guess a barking treefrog. Although the photos for the barking treefrog on the UF link show brown specimens, they also come in various green patterns.
They're great frogs to have around. I'd love to have some around our house.
Here is a link with photos of green specimens and their sound. If they are barking treefrogs, you should be hearing that sound at night, especially when a thunderstorm is nearby.
YouTube - Barking Treefrogs in our backyard (just our audio)[/URL]