A friend of mine has been musing about this brew for some time. I almost lost it when I saw your picture here. Needless to say, a copy has been sent for his amusement!
The "Old Frothingslosh Brand" was developed' by a local morning radio host named Rege Cordic back in the 50s. The guy aired all kind of skits with fictional characters and did spoof advertisements. (Same kind of stuff everyone from Saturday Night Live to Limbaugh do now, but Cordic was probably the first.)
Cordic, BTW, was the the inspiration for a guy named Adrian Cronauer who interned at the station during his high school years. Cronauer went on to some sort of fame as the character played by Robin Williams in the film 'Good Morning Vietnam'.
All the characters and skits you saw in that movie were inspired by the stuff he (and I) heard every morning on Cordic's show back in the 50s. It was really funny stuff.