My 4 month old puppy got neutered and he’s ears changed after wearing an E collar. Will they go back to normal?

Well that's pretty funny about your dogs ears! There really isn't a good answer to your question, maybe they will, maybe they won't. Hope things work out the best for you.

Dog breeds with erect ears, are born with floppy ears. They would start to stand right around the age your dog had the e-collar on. it sounds to me, like your dog just has erect ears now. If you google images of a German Shepherd puppy, you will see they all have floppy ears.