Are Fossilized Crab Claws A Thing? (Fl Gulf coast, around Tampa)

I love to beach comb and I find these things fairly commonly. I almost always pick them up thinking they are sharks teeth. They look just like pieces of crab Claws and they are super thick and solid, which would lead me to believe they may be fossilized. Some are rather large. Can anyone give me some information on them? It's cool if they aren't fossils - I still like them! :)