How old is he because this may not be teething - just interested in anything he can get into! Basically you have to remove EVERYTHING you value from the puppy or it will be fair game. And invest in a crate for when you can't supervise what he's getting into, some of which could be outright dangerous!! Plants for sure, and stones could result in him ending up on the vet's operating table. Using a crate could quite literally save his life. Our second lad was a bit like that - he left his mark on the steering wheel of a comparatively new car, and the brake handle, both done when we put him back in the car, going back to look for our first Basset who had taken off.
For teething, put a damp flannel, or similar, into the freezer for him to chew on once frozen. If teething is proving really painful for him, your vet can prescribe something for that.
These days before you can start to get him out for more exercise, to make him tired, can be a real challenge.
I'm loving his ticking ..... and good bone there too. Where did he come from (bloodline?)