Observations by kokafishin

Not sure what exactly these are or if they're even from the same species. I saved 12 of these from a 1-2 square foot puddle where they all were along with 5 crayfish (2 of them extremely large) and a decent amount of aquatic bugs. At least another dozen were dead and dried up nearby in and 2 or 3 were dead and slightly torn apart in the puddle itself. They came from the main channel which overflowed after recent storms but has since returned to normal levels. I've caught Fathead minnows here before so maybe that's what they are. I don't really know and appreciate any help. Thank you!