Forge: to form by heating and hammering and beating into shape!
Well that is an interesting word to try to work a prompt around and a still life at that! I recently started the hobby of stamping on metal. I've been enjoying stamping on old silver cutlery and I've made some pretty funny and interesting pieces.
Forge can also mean a fireplace, a hearth or a furnace for heating. Can you create a still life with the word 'forge' in mind? You are going to need to put your thinking cap on for this one! It might mean setting up a still life on a fireplace or hearth. Or, if you like "beating something into shape", try a still life with baking beaters! Hammers and gardening tools are also good for pounding! As are punching gloves!
Have fun. Get creative.