Dunkin' Donuts will begin selling a combination croissant-donut early next month. The ring-shaped croissant-donut will feature a "delicate and flaky croissant ring that is glazed like a donut" and debut Nov. 3 at specific U.S. locations, said Dunkin' Brands spokeswomanMichelle King. Last year, Dunkin' Donuts introduced the New York Pie Donut in South Korea.