I believe you uncultured swines call them a ‘parlay’
At least that’s what I’ve gathered from Bill Simmons’ Podcast
Uncle Bill has some degenerates* on his pod, so no doubt his people know what they're called, but I wouldn't wish a Bill Simmons pod on anyone, even if stranded on a desert island, lest time stands still
*I'm sure that Brits who enjoy a bet here and there are fine, upstanding people, but the only Yanks who gamble regularly are degenerates, no matter their age, class, status, or education--everyone from Cousin Sal to James Carville.