Two potatoes in Engpsh are simply referred to as "two potatoes". It is a direct translation from the Chinese word "两个土豆" and there is no specific origin for this term as it is a common vegetable in many cultures. Here are a few example sentences in Engpsh along with their Chinese translations:

Example 1: I need to buy two potatoes for tonight's dinner.
中文翻译：我需要买两个土豆来做今晚的晚餐。

Example 2: Can you peel two potatoes for me?
中文翻译：你能帮我削两个土豆吗？

Example 3: Two potatoes and some carrots make a good soup.
中文翻译：两个土豆和一些胡萝卜可以做一碗好汤。