I've seen known Apalachicola duskies with "spots", because they have a pattern on their backs as juveniles, but they are variable. The photo here reminds me of those and looks similar to what I think are Ocoee larvae I found in NC (which some folks also said were Eurycea

). There needs to be a guide book to sally larvae. They're really hard to ID!
I thought the main difference between these two genus were hind leg stoutness, relative to front legs. Desmogs have thick back legs. The hind legs on this guy looked stout to me, but I could be wrong.
For example, I'm 99% sure these are Desmogs in large part because of habitat and abundance.
http://www.naherp.com/photo.php?v_id=329836
http://www.naherp.com/photo.php?v_id=322588