I've been researching the old cow moo can toys. It's not easy. Everyone seems to have a different name for the toys. They've made a resurgence in popularity, including a fun iPhone app!, thanks to the film, Despicable Me.
Do you remember these toys? When I was a kid they were metal cans with lithographed paper labels with the picture of an animal. You turn them over and they'd make a sound like that animal. A cow, cat, goat, chick, etc.
Similar-looking devices were placed inside figural salt and pepper squeakers. The criers in dolls often looked like them. How about Steiff growlers in stuffed bears?
Metlox of California had a limited run of Poppytrail animal-themed cookie jars with sound devices in their lids. Still trying to get more information on those.