No; for communication.
And humans are story-tellers. It’s what we do. It is, quite possibly, what makes us human. What would happen with a group of children raised with nobody to tell stories to them I have no idea; but I think you’d get at least rudimentary stories coming from the children themselves.
Neither, theoretically, do my cats and dog: but they communicate a great deal, all the same, among each other as well as with me. Some of the communication with me is about food or opening doors, but not all of it.
Humans, as I said in another thread, are weird about sex.
It would be fascinating to me, if it were possible to actually see this experiment, to find out whether, starting over from scratch, we wound up with patterns more like chimps, more like bonobos, or something else altogether; also whether, if provided with some sort of leather or fabric, the humans started spontaneously wearing clothes and if so in what fashion.
But I’m afraid the children, even if raised with full access to each other, would all take large amounts of damage; and if raised separately would take such damage they might not even survive.
– I can’t think of the name of the author, or of most of the story: but I once read a science fiction piece in which the humans were at war with members of another species, and the other species had animal assistants, rather like we have dogs. Turned out the assistants were the descendants of infant survivors of an earlier portion of the war, taken captive but without any adult humans or older children; they’d developed in such a fashion that their captors never realized that they were potentially sapient. Fiction, of course; but maybe not an implausible guess.