(dated) playmate; companion for someone (especially children) to play with.
1922, Margery Williams, The Velveteen Rabbit"I’ve brought you a new playfellow," the Fairy said. "You must be very kind to him and teach him all he needs to know in Rabbitland, for he is going to live with you for ever and ever!"
1912: Edgar Rice Burroughs, Tarzan of the Apes, Chapter 5Now she was within ten feet of the two unsuspecting little playfellows--carefully she drew her hind feet well up beneath her body, the great muscles rolling under the beautiful skin.
