I think the trouble with duckspeak isn't the concept, it's the word itself. Unlike doublethink and his other neologisms, this isn't one where you could guess the meaning without the explanation. Even with it, and even with having owned ducks, I look at it and go "really?" Yeah, ducks quack, but not that much, and it's not what they're known for. And ducks, at least, seem to see some meaning in the quacking.

Top of my head alternative: yapspeak. Everyone knows about dogs who do nothing but yap, and unlike barking, which conveys a message, it's annoying and meaningless beyond "look at me, I'm yapping!"