Depends on how big and how many they got to crawl over to get to you

If you are talking about throwing rocks they would probably catch them and eat them. The gator in the above picture had a 1911 unloaded into her by the previous owner of this property, she took off for about a year then returned, I've always considered the 1911 more effective than a rock and though she lost an eye to the pistol she is still one tough reptile.
The scutes or ridges that run down their backs are actually solid calcium, like bone. I'll cut a strip down the back ridge of scutes and grind down the scutes, a pattern develops, then make a belt out of it. I'll try to take a few pictures when I get home.
The concho like thing on this sheath I made is one of these back scutes.
This is the same as the belt but done with a thinner strip that are on the sides near the belly, used as a hatband on this hat I felted.
I've made quite a few things out of gator, they should have more fear of me than I of them