The Grunt - An unusual name for such a tasty dessert

I make my living as a food photographer.

I was hired recently to shoot a magazine story on fruit desserts. The four recipes I photographed were the Grunt, the Betty, the Buckle, and the Pandowdy.

Where do these unusual names come from?

http://www.cooking.com/advice/adfeatu2.asp?Alias=AR_crisps