Hello Brittany,
A growler is a device which is put inside the teddy, so that when it’s turned upside down and then the right way up again, it makes a growling or squeaking noise.
Given their age, the eyes are probably glass.
Here’s a link to some history of the Steiff bear, one of the more famous teddy bear manufacturers, which should give some background, even if your bears aren’t Steiff:
http://www.steiffteddybears.co.uk/more-things-steiff/history-of-steiff-bears.php
Best wishes
Rose
