I believe Grumpy talks, but he hasn't spoken for us yet. He has whistled a few different things, wolf whistle, bob-white, and Butch said today he whistled Red River Valley. He also has quacked like a duck, and growled like a dog. He waves at us when we say hi.
He is quite skiddish of new things, but I know that is normal. I got him a new toy and it scared him, so I took it out of his cage and hung it on the outside with little bits of it sticking in through the bars. I will move it inside when he starts to pick at it.
We have a 7 year old cockatiel, Sunshine, who we got when she was still being hand-fed. Grumpy watches as she comes out to play. I think this will also help him. We also are keeping my parents parakeets, Pete and Gracie indefinatly.