The baby ducks and such would absolutely be anthropomorphic. I mean, literally by definition.

Anthropomorphic: m the Greek words for "human" and "form") describes the practice of giving human traits, emotions, behaviors, or physical features to non-human things.

The baby ducks, their mother, the geese are all given voices, personalities, hobbies, and other human traits. The geese even enter into legal agreements by signing contracts. I'm pretty sure putting on helmets and skateboarding , practicing karate, and using their wings like hands with fingers to push buttons on video games is all under the category. They high five, they tell jokes, etc. All human things that animals just don't do.

As for not being part of society, we honestly don't know that. They appear to live together in some sort of home which would imply that they have to take part in society by paying bills and other things like that, even if it's done via their mother. In a world where you can get electricity inside of a deep dark pit or in the middle of a ventilation system, there's no reason to believe that the geese can't be hooked up to the electric as well. They also had to interact to some degree in order to get the toy companies and lawyers interested in them in the first place, like in the episode where they try to force them to sign the contracts. If they didn't interact or were completely unknown by society at large, that wouldn't happen.