We have had this question before, and the answer was that "Captain Morgan" is custom lettering, as most logos are. If that's not the lettering you are interested in, you should show us a picture of it.

For pirate-themed fonts, just search at MyFonts.com with the term "Pirate" and you will get a number of suggestions.

- Mike Yanega

A good overview of pirates-styled typefaces:
http://mickeyavenue.com/fonts/pirates/

some pirate themes you will find at

http://moorstation.org/typoasis/pirates/index.htm