There are scholars who believe that Herodotus could be talking about the Mongolians based on their physical description as well as their culture.
[1] Herodotus only relied on secondary sources for his account, drawing from descriptions of Greeks and Scythians such as the detail about the Argippaeans as bald people.
[2] As far as their country, the tract of land whereof I have been speaking is all a smooth plain, and the soil deep; beyond you enter on a region which is rugged and stony.
Passing over a great extent of this rough country, you come to a people dwelling at the foot of lofty mountains, who are said to be all—both men and women—bald from their birth, to have flat noses, and very long chins.
When the fruit is ripe, they strain it through cloths; the juice which runs off is black and thick, and is called by the natives “aschy.” They lap this up with their tongues, and also mix it with milk for a drink; while they make the lees, which are solid, into cakes, and eat them instead of meat; for they have but few sheep in their country, in which there is no good pasturage.