The biting has changed 😬

Help!

Hoping others have experienced this.

We hit 10 weeks today and the past few days we have encountered a whole new beast. Our pup has always been a heavy biter. It's testing but we were managing it with regular enforced naps. Things have shifted into what seems like aggression? Is that possible at his age? The biting seems to be intentionally to hurt us and is accompanied by this awful sort of growling (?) / barking sound? He's sounds outright NASTY tbh. If he were an adult do i'd be frightened of him.

What's going on here? He's recently had a vet check and we mentioned it to check for pain but he didnt show any signs of pain at the vet and tbh it isnt triggered by touch. He doesnt it when we go to clip his lead on and he goes crazy doing it at our feet 😭 This is my first time experiencing the puppy blues with him and its because a) im scared im getting an aggressive dog and b) he's truly unlikeable when he does this.

Is this all part of the puppy phase? Does anyone else have a nasty little ferret on their hands?

ETA im really not sure i described the sound well. It's the sound they make when your playing tug with them? Not a growl really? It's an awful sound.