No. You’ll probably get chicks that have more of a cochin body shape and chicks that have more of the body shape of the other parent. Or they could all have something in between.
Breed the offspring back to the yellow feet/beak parent (50% yellow, 50% white carrying yellow) or breed the offspring together (25% yellow, 50% white carrying yellow, 25% pure for white).
Chickens inherit genes equally from both parents. For your last question, the feet and beak would be white, because that’s a dominant gene. However, the offspring would still carry the recessive gene for yellow feet/beak, because they inherited that from their other parent.