When my daughter was two, thirty-five years ago, and we were teaching her the parts of her body, arm, leg, eye, nose, ear, etc. and she came to her fore head she pronounce it fork head which quickly morphed into fuk head.
She pointed at my brother once at our nother's house and said "fuk head". Everyone had a very surprised look on their faces and my brother said "well, I guess I've been told". I had a hell of a time explaining it.
Couldn't break her of it so we avoided ever asking her about her fore head.
She also called a McDonalds Happy Meal a Puffy Milk.
So was so cute.