I'd just call them Twelves or Twelfths. As in:
Joe Sixpack: Hey, whatdya think of the 12th at Muirfield? Jack really scored with that one, eh?
GCA poster (stroking beard): Naaaaah, that's just a Twelfth...
Some other ideas, mostly too wordy:
Freddie's Delight
Freddie's Happy Accident
Rae's Revenge
Rae's Little Devil
Swirleybird