WW asks:

So why did Bud opt for the frog? Seems the slug would have been a natural animal for promotion of beer...

What - "BUD: Drink it and die!"? Doesn't have much of a ring to it...

And I don't know about your proposal, Dr. Bill, although it would be worth a try. I always got the feeling that the scent was a big part of the attraction for them. Or whatever sensory organ takes the place of a nose on those repulsive creatures. , I repeat!