Be warned - this is high output, but you could probably modify it down if you wanted them to be producing less unscaffolded language.
I put kids in groups of three or four (I wouldn't do two, or any more than four), and gave them each:
a. a die
b. a short list of vocab words (5-8 words)
c. a list of six questions
Every group got a different list of vocab, and there were three separate question lists, so when they finished one, they got a new set of vocab and a new set of questions.
