No, afraid not!
No, of course not, but there is a real Duff Beer.
Duff beer
Duff Beer
Her is the Spokesman for Duff Beer
Duff Man is the human mascot for Duff Beer.
True
Duff beer is produced in several countries, but you can't order it in the USA. In fact, 20th Century Fox is pursuing a copyright infringement lawsuit against the breweries producing Duff. More Info: http://www.thresq.com/2009/12/fox-duff-beer-trademark.html
Duff Beer.
DUFF
Duff Beer
He seems to favour Duff, but has also had Duff Lite, Duff Dry, Billy Beer (In the Spinal Tap episode) and Fudd (The Lurleen Lumpkin episode). I don't remember any other.
Homer's Odyssey