Sometimes an illustrated open mouth, depicted on a package, is not a window, but a graphic device containing the product logo. Caveman Cookies and Snackle Mouth packages both have stacked logotypes contained in the gaping mouths of their illustrated characters. (Kristina Sacci designed and illustrated the packaging for Caveman Cookies; Nate Dyer of Moxie Sozo designed and illustrated the Snack Mouth packages.)
Package design for Fresh & Easy kids cereals (by P&W) uses a similar device, except that, along with the Fresh & Easy logo, the mouths contain additional typography.
(One more example, after the fold…)
This Kit Kat wrapper from Jason Liebig’s Flickr Photostream is a little different from the others since the mouth is in profile. The implication that the logo —a proxy for the product— is about to be consumed is undeniable.
(See also: The Glasgow Grin)