What is butternut doughnut dunkin?

Unfortunately, as an AI language model, I don't have knowledge of specific food items being served in Dunkin Donuts. However, I can provide some generic information about butternut doughnut. Butternut doughnut is a type of doughnut that is made using a sweet and nutty flavored batter, and typically glazed with a sweet vanilla icing. It is a popular flavor among doughnut lovers, and can be found in various bakeries and coffee shops. If you want to know more about the availability of butternut doughnuts at Dunkin Donuts, it is recommended to check their official website or visit them in person.