GREAT OLD ONES CHAUGNAR-FAUGN

Some were the figures of well-known myth — gorgons, chimaeras, dragons, cyclops, and all their shuddersome congeners. Others were drawn from darker and more furtively whispered cycles of subterranean legend — black, formless Tsathoggua, many-tentacled Cthulhu, proboscidian Chaugnar Faugn, and other rumoured blasphemies from forbidden books like the Necronomicon, the Book of Eibon, or the Unaussprechlichen Kulten of von Junzt.
—H. P. Lovecraft, "The Horror in the Museum" (emphasis added)

Chaugnar Faugn (The Elephant God, The Horror from the Hills) was created by Frank Belknap Long and first appeared in his novel The Horror from the Hills (1931).

Chaugnar Faugn (or Chaugnar Faughn) appears as a horribly grotesque idol, made of an unknown element, combining the worst aspects of octopus, elephant, and human being. When Chaugnar Faugn hungers, it can move incredibly quickly for its size and use its lamprey-like "trunk" to drain the blood from any organism it encounters.

Chaugnar Faugn came to the Earth from another dimension eons ago, possibly in a form other than the one it later assumed. Upon arriving, he found the dominant lifeform to be only simple amphibians. From these creatures, he created the Miri Nigri to be his servitors. The Miri Nigri would later mate with early humans to produce hybrids that would eventually evolve into the horrid Tcho-Tcho people.