Is formmen the past particple of form?

No, "formmen" is not a word in the English language, and it is not the past participle of "form".

The past participle of "form" is formed.

Here are some examples of how to use "formed" in a sentence:

* The clay was formed into a beautiful sculpture.

* The team was formed by a group of friends.

* The opinion was formed after careful consideration.