Wikipedia
Moon-beasts are creatures in H. P. Lovecraft's Dream Cycle. They are “great greyish-white slippery things which could expand and contract at will, and whose principal shape — though it often changed — was that of a sort of toad without any eyes, but with a curious vibrating mass of short pink tentacles on the end of its blunt, vague snout” ( The Dream-Quest of Unknown Kadath, Lovecraft). They live on the dark side of the Dreamlands' moon which, unlike the moon of the waking world, has great forests and oily seas.
The Moon-beasts sail black galleys between the moon and the Dreamlands, trading rubies for both slaves and gold, at the port of Dylath-Leen. When there, they employ the Men of Leng, disguised in turbans, as their go-between and stay hidden below deck, less the merchants of Dylath-Leen learn the terrible secret of with whom they are dealing.