My son has just received a roaring rex from toy story 3 for Christmas and it sounds more like a duck when you squeeze it. According to other reviews, other people have the same complaint, what can be done about it.

Have you got the reciept? Or have the people who bought it got the reciept?
We bought my son th Toy Story 3 Buzz Lightyear and at xmas, found that the wing was broken. We couldn't do anything about it though because we had bought it a month prior to xmas and was no longer aloud to bring items back.
A friend also bought Toy Story 2 Woody and when you pulled his cord, he was missing 2 phrases. I love toy story, but I think they're toys are not so good.

If you haven't got a recipet, then I doubt you could do much. You could try and go back to the shop and explain to them and they might take it off your hands and replace it without a reciept.

Good luck.