Yams, also known as Ñame, are normally log-shaped with shaggy brown skin and crisp flesh. What are mistakenly called yams in the U.S. are actually sweet potatoes. Yams are similar in appearance and usage to a sweet potato but with a sweet, crunchy taste. Yams can be kept for about 5 days. A good source of Vitamin A. Store at 60-65°F.