Yes, Cantaloupe is safe, most melons are to my knowledge.
Brought some Watermelon home for Snuff, he's never had it, he didn't like it, hee. Strange bunner. I think he nibbled when we were away from him though.
Mine love fruit salads once in a great while. When I make myself one, the buns and the pigs and rats all get a bit of any fruit I use. They seem to eat most of it. Especially watermelon and cantaloupe.