Mother ignore the growling. Jolly him out of it. Approach in a sing song, happy voice - 'who's a silly silly billy then - I'm only coming to say hello' sort of thing. Don't shout to counteract the growl or confront it.
You have a baby, baby dog who has only just arrived home and is probably a bit frightened and is certainly unsure of himself. He's communicating the same way as he will have done with his siblings. At that age, it means nothing in terms of temperament.
Take him a treat when you go over to him while he's eating. Offer with the silly, happy voice and I expect it will pass very quickly. You are aiming for him to associate you with happy, confident, consistent actions and treats. Positive stuff which makes him feel safe. Made sure you're not threatening in any way - don't tower over him for example. Bend down, or kneel by him.
HTH.
stressed. In the nicest possible way, you've got to calm down. Both you and your DH. There are likely to be many more weeks of accidental wees and poos on the floor. It doesn't mean you or your dog are unusual or doing anything wrong. Only 2 accidents over 2 days is good going.
And more importantly, your puppy will be picking up on the anxiety and stress from both of you - he really, really will. All the time. And not understanding it. It will confuse him, alter his behaviour and make him far more difficult to handle.
From what I can work out your puppy is a very, very young dog. 12 ish weeks? I fear your expectations are too high. They do wee and poo wherever they like when they're young. They don't just know that we expect them to go outside for it - we have to teach them and to get it perfect takes time. Children usually take a while to get potty training perfect - puppies are the same.
Ignore the inside wees completely (unless you catch him actually doing it, then a firm no, pick up and put outside) and go mad with the outside ones. Work out what his most favourite treat is - squirty cheese, frankfurter sausage, whatever and offer that when he gets it right. Along with masses and masses of over the top praise.
I hope I haven't offended - you're clearly struggling - but until you lower your expectation of him and take everything down a notch or ten, it's not going to get any better.
Clam you probably already know this, but he'll be fine. You'd only be in trouble if he'd snaffled masses of really high quality chocolate. Cake. No worries. He's a pig :)