No, tapioca starch is needed to make taro balls. Here are the specific methods.

main materials: sweet potato 26g, purple sweet potato 26g, yam 26g

auxiliary materials: sugar 6g, sticky rice flour 9g, tapioca starch 21g

Practice:

1. Wash sweet potato and yam, put them in a pot, and add appropriate amount of cold water to boil.

2. Boil the purple sweet potato in another pot.

3. Peel the boiled yam, sweet potato and purple sweet potato, and grind them into mud with a spoon.

4. Add 1/3 sugar, 1/3 sticky rice flour and 1/3 cassava starch to synthesize non-sticky wheat flour. Similarly, the other two foods are kneaded into the same batter, and each of them is kneaded into strips.

5. Cut it into 1cm-long sections with a knife, and then knead it into a ring.