'Tǔdòu' shì běifāng de jiàofǎ, nánfāng jiào 'yángyù'.
'Tudou' is the northern term; in the south they say 'yangyu' (for potato).
Tips
grammar
叫法 follows the verb + 法 pattern meaning 'way of doing X': 说法 (way of saying/statement), 做法 (way of doing/method), 写法 (way of writing), 看法 (point of view).
