Yes. There is a random encounter with a non-hostile radscorpion which may happen at various specific locations. It doesn't really serve any purpose. It will turn hostile if you stay near it for a few seconds, though.
no they attack you if they see you
in F2 there is
The Fallout 2 friendly scorpion can turn hostile if you beat it at chess, but will be friendly again if you leave and come back. It might turn hostile if it catches you trying to steal its glasses.