Is the plural of mango plus es? Why? Is it necessary to add es to all plural nouns ending with o?

Is the plural of mango plus es? Why? Is it necessary to add es to all plural nouns ending with o?

There are only four in junior high school. Of course, I will learn more in the future. Hero heroes mango tomatoes tomatoes / tomato potato potatoes / potatoes has a very interesting formula to help you remember. Hero eats potatoes mango tomatoes, I hope to ask