I can guarantee you that at 4, I had not heard "vagina", but I heard "Aunt Jemima" before I heard "vagina" and no one in my group of kids below the "age of discovery" at about 10 mentioned "vagina" during play.
I happened to catch the end of Chitty Chitty Bang Bang a couple of days ago and the little girl was named "Jemima."
I happened to catch the end of Chitty Chitty Bang Bang a couple of days ago and the little girl was named "Jemima."