So, a while back, I was asked to design some enemies for an RPG Maker game, and goblins were to be one of them. I got a bit carried away.
Goblin: Tribal amphibious crocodilian humanoids, they can be found most often in swamps. Each tribe has a Chieftan, which is an inherited title.
Bublin: Bublins are a sub-species of Goblin, and unlike their cousins, they prefer open oceans. They remain submerged much more often than their Goblins, and are far more aggressive and unorganized. Leadership of Bublin tribes is earned, and it is not uncommon for said leaders to be killed an replaced in less than a week. Bublins are known to attack ships so often, that some tribes make pirate honorary members.
Also, Bublins tame shark pups.