Nope
Brogg puts an arrow on the anvil.
As poetic as that statement may be, nothing happens. The blacksmith construct remains motionless. (Nothing happens if you try the spear or any other object on the anvil.)
There is only a binary knob on the contraption inside the construct, and a small, oily hole at the top of the blacksmith's head. On further examination, turning the knob seems only to cause a small spark to momentarily flash inside the contraption, but nothing else happens.