getting dinner ready can be an exciting / arousing time for any dog. the growling and barking can just be hurry up hurry up hurry up etc haha, or its just his way of venting his excitement, my mums dog is very vocal and she won't be quite when its dinner time. as long as its not particularly directed toward you i.e as in slightly aggressive i wouldn't worry too much about it, just make sure that he is quite when you give him the food, make sure he is away from you when preparing and he can't hear it.
what do you mean by lying down? when you are trying to relax? on the bed? on the floor? etc etc it could be a few things ill see what i can think of from some more details
oh and 10 week old puppy?? PICTURES!!!! haha
"In order to really enjoy a dog, one doesn't merely try to train him to be semihuman. The point of it is to open oneself to the possibility of becoming partly a dog." - Edward Hoagland