They are native around here (Galveston,TX).
They are very edible to 5-foot sharks, kingfish and 40/50 inch redfish. They are a preferred bait for those two fish. Lots of kayakers (not me) go a half mile offshore into the Gulf of Mexico and catch those sharks and reds from their 12-foot kayaks.
I have no idea if anyone tried eating them. They are so very thin (less than 3/4 of an inch) so I doubt if anyone would try to clean and cook them. Then, some people will eat anything. regards, richg99
https://www.texassaltwaterfishingmagazine.com/fishing/kayaking-offshore/subpage2235.html