The bestial Voormis appear often in Clark Ashton Smith's Hyperborean Cycle, worshipping Tsathoggua under Mount Voormithadreth. Compared to the gnophkeh they are a more generic sort of ape-man, being basically red-furred yeti with the only described oddity being three toes. They are portrayed very differently in the various stories, ranging from degenerate cavemen to near-sapient animals, but they are always described as having an inhuman blood-lust.
This variation in how primitive or animal-like the Voormis appear is partly because the stories can take centuries or millennia apart, during periods when the Voormis are either advanced enough to fight off human invaders, or having an extended degenerate period of living stunted in caves. Compare that to the portrayal of Picts in Howard's stories, where that people goes through multiple periods of advancement or barbarianism, all the way from their civilization's peak during King Kull's lifetime in 100,000 BC to post-Roman Britain, long after their last great king Bran Mak Morn has died. With the Voormis there is also the point that they are usually talked about in unflattering accounts written from the in-universe perspective of humans, except for the story "The Scroll of Morloc" which focuses on a shaman of their ranks.