We asked the children's librarian for some pirate books and she pulled a few for us.
Just look at my sweet boy
One of our favorites was Henry and the Buccaneer Bunnies by Carolyn Crimi. It is a great book that incorporates all of the pirate jargon, but none of the scary stuff. One of the other books we got had pirates being chased by ghosts and a captain that "sold his soul" for gold. Ugh!