Since these are showing up in such large numbers here are a few quick ID points.
1. Note the White line on the Dorsal part of the snout. This is a typical Atractosteus trait and will only be found in Spatula, Tropicus and Tristoechus under the size of 5 inches. This if present is a dead give away to the fish being Atractosteus.
2. Very big fins.. Young gators have very large and developed Dorsal, Anal, Pelvic and caudal fins. The Pectoral however remain rather small and stubby.
3. Short broad snout roughly just a tad larger than the length of the head. Most Lepisosteus under 5 inches will show a much more narrow and longer snout.
These are just a few points that will quickly let you narrow species and also ID these gators.