The turnip you mentioned is also called turnip, which is commonly known as kohlrabi in the north, and some are also called kohlrabi. This is not taro, nor is it a big taro. Many people confuse taro with yam.

turnips (turnips, commonly known as kohlrabi in the north, are spicy)

Yams are also found in the south, but they are smaller than those in the north.

Taros are big, each one is about a kilo.