The croc's inhabit the lagoons on the back side of AC and wet spots and lagoons on most of the other islands. They have not been a danger to humans that I know of to date, but that could change. I know they have eaten a few dogs in the past and that caused the locals to trap and relocate them. I have not heard from anyone that they have ever been killed for eating the dogs.
When we were there last year and the year before, there was a ten footer in the lagoon by the water plant. We fed it some chicken and some of the road kill land crabs. It was pretty shy, and would only come out on the land a few feet, and only if everyone stayed way back.
I think they should fence off a big chunk of the lagoon and feed the croc. It would be great for tourism, and would enhance the knowledge and hopefully the appreciation of these wonderful and amazing creatures. I know they have crocs on Caye Caulker and on Caye Chappel, and of course on the mainland, so I think you could assume they are pretty much everywhere.