Here's a few Lovecraft characters that are possible candidates.
Ghadamon - A Seed of Azathoth - A bluish-brown, slimy monstrosity riddled with holes, and an occasional malformed head.
Gol-goroth - God of the Black Stone, Golgoroð - Appears as a gigantic, black, toad-like creature with an impossibly malevolent glare, or a tentacled, scaled, bat-winged entity.
Hziulquoigmnzhah - The God of Cykranosh, Ziulquag-Manzah - Has spheroid body, elongated arms, short legs, and a pendulum-like head dangling underneath. It is the brother of Ghisguth, and uncle of Tsathoggua.
Lythalia - The Forest-Goddess - Appears as a female humanoid entity covered in vines and vegetal parts.
Ragnalla - Seeker in the Skies - A titanic raptorial fiend with a huge, single eye and a crown of tentacles.
Th'rygh - The Godbeast - A monstrous entity manifesting as a horrible patchwork of flesh and soil and alien matter.
Yegg-Ha - The Faceless One - A 10 foot-tall winged being.