New Miniature Tree Frog??

[Nora]

This set of pictures really looks to be the Little Grass Frog, Pseudacris ocularis/Limnaoedus ocularis
which tops out at about 5/8" and is native to your area. Here are some links:

AmphibiaWeb - Pseudacris ocularis Amphibiaweb is my go to site for frog id & info. many entries also include calls.
Florida Wildlife Extension at UF/IFAS
CalPhotos
SuperStock - Little Grass Frog (Limnaoedus ocularis) 1/2 Smallest Frog in NA/SE USA