Yes, penguins do have knees! A penguin’s leg is composed of a short femur, knee, tibia and fibula. The upper leg bones are not visible as they are covered in feathers, giving the penguin the illusion of short legs and no knees. No go the fuck to sleep.
It's faster than opening Word and typing it in, or opening a dictionary ap. (I don't think I've cracked open a dead-tree dictionary even once in the last couple of years, but I look up words several times a week.