What kind of fish is Jinbe?
Jinbe is a whale shark fishman.


  Jinbe is a large blue whale shark fishman with a stocky build similar to a sumo wrestler and a face that is commonly associated with various Japanese demons such as the oni


Focus on oni because it's related to his two white fangs.


  He also possesses two tusk-like conical lower fangs associated with Oni as well; the rest of his teeth from the upper and lower rows are pretty much the same, albeit much smaller. He also has a severe underbite, which makes room for his huge fangs.




Source for above quotes: Jinbe - The One Piece Wiki (emphasis added)