PART ONE: STUPID GOBLINS, WEIRD GOBLINS
Goblins are immortal.
Goblins never eat or drink.
Goblins die in droves. Why? Because they either get murdered by fellow goblins, or they get the dwarves angry and die in battle.
Goblins can be conquered by humans.
Goblins retain their snatcher status as a human-conquered unit.
Goblins with a snatcher status will snatch babies and bring them home to the capital.
Any person from a civilization can join a different civilization, unless they are hostile to them.
Therefore, any civilization can have any sentient being. Except for nonconquering all-hostile non-snatching beings...
Like kobolds.
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PART TWO: SPOONY GOBLIN BARDS
Goblins are immortal.
Goblins never eat or drink.
Goblins? In your dwarven civilization? It's more likely than you think.
Dwarves are VERY VERY GOOD AT BATTLE. This is partly due to their species, and partly due to their strategy, and partly due to their fortresses. A dwarven-born goblin can get almost all of these benefits.
Goblins in a dwarven civilization, therefore, can live for a very long time, even if they are a soldier.
And which 1000-yr-old goblin wouldn't dabble in poetry? Or singing? And with another millenium or two on their hands, a "bit of time" practicing can get them to Great or above.
And dwarves do appreciate a good bit of poetry.
Therefore, goblins make good poets. (Applause.)
((And yes, I do think that goblins are like goblins because of how they were raised. Dwarven-raised goblins can be just as good as any dwarf. Stop looking at me like that! Racists! RACISTS ALL OF YOU!!))