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Stories about: croak

10 Things You Did Not Know About Croaking! 1. A croak is produced by frogs by pushing air through the larynx in the throat. Most frogs have vocal sacs that amplify the sound. These are elastic skin membranes that work by distention. Tree frogs, toads and most South American and Australian frogs have just one vocal sack located under the throat (it can be larg... 29 September 2007 06:14 GMT