Dwarf

The term "Dwarf" might be applied generically to any of a number of Mythos races, including the following....

Dark Ones

The Dark Ones, also called: Miri Nigri, Dwarves, Black Elves, Goblins, Zwerc, Zwerg, Dwerg, Draugr/Draugar/Draugur, Duerger, "Again-Walkers", "Ancestors", "Dead Man of the Mound", Bog Men, etc.

A race of twisted undead "dwarfs" in the form of decaying corpses or living bodies hosting an alien horror described in such texts as the Apocalypse of Paul as a two-headed worm, about three feet in length; Dark Ones are first described as a Mythos race in Cthulhu Dark Ages.

See Dark Ones for more details.

Lurkers

See Lurkers for the undead, hooded, dwarven creatures resurrected to work as grave-robbing slaves in the Phantasm (1979 franchise).

Trolls

See Trolls, for a broad category of mythical creatures that crosses over with Dwarves.

Machen's "Little People"

See the separate article on Faeries, dedicated to Machen's "Little People".

Robert E. Howard's Worms of the Earth

See the dedicated article on Worms of the Earth (race)

Derleth's Tcho-Tchos

See the dedicated article on Tcho-Tchos for this fictional human-like race of bestial, alien cannibals.

Deros and Morlocks

Morlocks, a devolved, subterranean, albino cannibal invention of H.G. Wells, and Deros, a creation of Richard Sharpe Shaver in books that were promoted as "The Shaver Mystery", are an ancient race of aliens living in caverns under the earth who, taking shelter from the harmful effects of the Sun's radiation (which interferes with the Deros' immortality), have slowly gone insane in the dark, damp caverns and vaults deep in the earth, and are responsible for tragedies, insanities, bad luck, nightmares, hauntings, demonic oppression, and alien abduction on the surface world, because sadism is the last pleasure left to these degenerate beings.

See Dero for details...

"Ape Men" and "Wild Men"

Hairy, ape-like, degenerate or proto-human "throw-backs" to primitive states of human evolution, variously called Gnophkehs, Voormis, Sagoths, Ptetholites, Mangani, Pakuni, Cavemen, Dawn Men, Piltdown Man, Orcs, Beast Men, etc.

These creatures, staples of classic speculative fiction, are generally thought of as close evolutionary relatives of human beings, who have never quite evolved into Homo Sapiens, or who have devolved into an almost ape-like condition, or who have evolved parallel to our species in some isolated corner of the world. These beings are typically of a wild and savage disposition, often living at, at most, a stone-age technology, and sometimes living at little more than the technological level of mere animals, though in rare cases such creatures have been reported to have evolved to surprising or even prodigious levels of technological advancement.

See Frazetta Man for more details on a variety of such creatures.