Puppy or Training? Need thoughts.

Hi everyone!

I have an intact 10 month old Bernedoodle. Great dog overall but I just need to know if this is puppy behavior that will naturally correct with time OR if it’s something we need to train with a trainer? (I’ve never had a puppy before).

1) Chews on kids stuffed animals and our pillow/blankets in the living room 2) Still mouthy… puts his mouth on my hand when we doesn’t want to do something; nips playfully at the kids clothes/hair/feet… 3) Bites at my sweatshirt sleeves, mittens, etc. 4) chases leaves and rabbits 5) Barks at strangers

Thanks!