My green cheek talks a great deal. They are somewhat harder to understand than, say, a Grey, but if you talk to your bird, you have a much better chance it will talk back to you! Especially if you say things in a consistent context and with enthusiasm.
You could see if your bird enjoys other veggies, like carrots, squash, kale, chard, really most vegetables that you would eat. My gcc loves corn cut off the cob.