Tropical tuber is a term used to describe a variety of root vegetables that are grown in tropical climates. The most common tropical tubers are TARO (4 letters), YAM (3 letters) and EDDO (4 letters). TARO is a starchy root vegetable with a rough, brown skin and white flesh. YAM is a sweet, starchy root vegetable with a thin, brown skin and white flesh. EDDO is a small, round root vegetable with a thick, brown skin and white flesh. All three of these tropical tubers are popular ingredients in many dishes around the world.