Defiantly blacksmith judging from the apparent fire burned jaws, but I doubt that it was designed for bending, I say that because of the long thin reins ( handles ) and the very long length of the jaws, features not conducive to leverage needed to bend metal. If it was for closing a folded seam, I guess that would have had to be hot work using hammer blows on the closed jaws. Other than that - no guess. Smiths were always making special purpose tongs for a given job. Look at pix of old smithies and you see walls lined with different tongs.
Joe B