So, has anyone found the legendary melee weapon saw ? i think its a part of the christmas theme and i would like to know more about it if anyone is willing to explain it to me

This: https://www.gamepretty.com/unturned-winter-holiday-festivities-achievements-guide-2021/
would give you a headstart on which vanilla map has which method to collect the Xmas Saw and Shovel.
For Russia, it is one of the quests on the Liberator. (Scientist)