Hear me out!!
Ghouls can make different vocalizations. They can purr, growl. Even do a weird chirp.
Strong stamp of approval on this one, Anon. We hear the much different range of sounds feral ghouls (and ghouls who are on their way to being feral) are capable of making, and they're all fairly inhuman sounding. I don't see why they wouldn't also be able to purr when you scratch them under the chin just right or whatever.

























