Shub-Niggurath, Black Goat of the Woods with a Thousand Dark Young, is the Outer God of Fertility in the Cthulhu Mythos created by H.P. Lovecraft. She is one of the most famous of the Outer Gods, alongside Nyarlathotep, Yog-Sothoth and Azathoth, and she tends to pop up in a lot of places.
The Dark Young of Shub-Niggurath are the most well-known spawn and servitors of Shub-Niggurath, in case you haven't figured it out from their name. These strange creatures resemble twisted, deformed trees from a distance, at least so long as they are at rest; they stride across the land on surprisingly goat-like legs, and have no bodily features save for one or more maws scattered around their body. From the top of their trunk-like torso emerges a random number of writhing, octopus-like tentacles.