Dunkin’ Donuts is a popular chain of coffee and donut shops based in the northeast United States, with locations all over the world. The company uses many other typefaces for their store signage, products, and marketing, but Frankfurter is most strongly associated with the brand. Their logotype is often parodied and immitated due to its iconic and easily recognizable style. By extension, in some parts of the world, Frankfurter has become associated with donuts in general.
I couldn't find an exact date or designer for the logo, but when it was slightly updated in 2002 with the addition of a steaming cup icon, it was the first change in “nearly 20 years”.