Yes, it is possible for them to be scared. But they shouldn't be scared. They should have had 8 weeks with their dam and litter in a secure situation where they were protected, and had lots of play time with their littermates.
Yes, they can be tentative in new situations, which can be everything, not sure who is safe. But the whole reason 8 weeks is a good time for pups to leave the nest is because they are not yet at the stage where strangers are automatically scary, and they have their puppy license yet, so they are unlikely to have a really crappy experience with another dog.
I may be all wet. It has been a long time since I have taken home an eight week old pup. Usually they cry for their dam and litter mates for a few nights. I don't remember them being terribly barky or scared of other dogs.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.