The term 'Sweet Potato Kin' is a crossword solution that can be filled in with the three-letter word 'YAM'. Yams are a type of root vegetable that are closely related to sweet potatoes. They are native to Africa, Asia, and the Caribbean, and are an important part of many traditional diets. Yams have a rough, scaly skin and a starchy, sweet flesh. They are often used in savory dishes, but can also be boiled, mashed, or roasted.