Thanksgiving is a holiday celebrated in the United States and Canada, and it is usually accompanied by a large feast. One of the most popular dishes served during Thanksgiving is a variety of vegetables. Two of the most common vegetables served are yams and acorn squash. Yams are a root vegetable that is often boiled or mashed and served as a side dish. Acorn squash is a type of winter squash that is usually roasted and served with butter and spices. Both yams and acorn squash are popular Thanksgiving vegetables.