Sabre's suggestion stems from the proliferation of wrought iron nails in old buildings. it is quite possible that your nails are wrought, and therefore, of some value since there is effectively none being produced anymore.
My suggestion is to keep them and if they turn out to be wrought, don't use them for a spoon, but something more "worthy" (entirely defined by you, may mean spoons).
Test them by heating to a good yellow and playing with it. If it forges like butter, it's probably wrought