This has been clearly been inspired by the products of the Whizzo Chocolate Company.

Especially their famous crunchy frog chocolate.

http://www.youtube.com/watch?v=lUh9Djcxgjs

This is een promo photo from a milk company called Melkunie. It's from a dutch advert for instant milkshakes. See also:

http://video.google.com/videoplay?docid=3186156620902974719&q=melkunie+zijspan&hl=nl

There where several commercials featuring cows in funny situations, promoting a range of milk products.