Hello, I know that at one time, hair (during testing) was a recoverable item in the F1 menu.

The question is, like a lot of deleted but still spawnable items, is it possible to spawn items like hair in the game?

If not removed from the game completely as Item you can search in item list from the website down below for the item or try via spawnitem or give then type item name and try to match it... https://www.corrosionhour.com/rust-item-list/

But I guess they removed them...