Board Thread:News and Announcements/@comment-25684944-20141122195511/@comment-27723099-20141202214423

That's because "goblin" is the word that the hobbits used and the hobbits never are east of the Misty Mountains. In fact, the only hobbits that have seen orcs in this time are Bilbo and the members of the Fellowship. Bilbo encountered the goblins/orcs from goblin town which are a small breed of orcs. The first orcs that Frodo encountered are the orcs of Moria, so basically the same as the orcs of goblin town. For the name "goblin town", I think it's not the name that the orcs themselves used. It's probably a name that only Bilbo used.