It seems that they're still 'marathons' in yankland
www.snickersmarathon.com/home.asp
(Londingham ., Sat 30 Dec 2006, 14:23, archived)

i think the marathon bar was from one of the colonies
south africa, or new zealand or something.
( scott,, Sat 30 Dec 2006, 14:24, archived)

that doesn't sound like the Snickers we have here.
Energy bar? Pfft. Chocolate and nuts, is what they are.
( spangolin - the odds are good but the goods are odd, Sat 30 Dec 2006, 14:25, archived)