Found this tool while cleaning out a workshop close to the sea, but what is it for and what's its name? I've guessed it's something for knotting, but can't find a reference on how to use it (it might of course be something totally else :)
The handle is in wood, the rest of the tool is made from steel, and the front part (that measures 20 mm at its widest place), looks like half a birds beak, a little bit curved. The tool is 180 mm long all in all.
Front:
Side:
Back: