Peanuts are actually considered legumes. While real nuts grow on trees, peanuts grow in pods that mature underground; other types of legumes, such as lentils and peas, also grow beneath the surface. Additional nut frauds include cashews, walnuts, pistachios, and almonds. Botanically speaking, they are classified as seeds of the trees (or fruits!) they grow on. Pecans and hazelnuts, on the other hand, are considered bonafide nuts. They also grow on trees, but unlike pistachios or almonds—which grow in small bunches—pecans and hazelnuts contain only one nut surrounded by a hard shell