Genshi Shōnen Ryū (Ryu the Primitive Boy), a Japanese anime that ran from 1971-1972, was about a cave boy in prehistoric times.
In episode 10, Ryū encounters
yeti and they aren't friendly.
Great to see this early 70s Japanese design.
In the story, Ryu is raised by an ape woman named Kitty, but she's not
yeti, despite the white beard.