Using dry whole feed corn as an alternate fuel for the blacksmith's coal forge.
Just one example.
https://www.tractorsupply.com/tsc/product/producers-pride-whole-corn-50-lb
Apologies in advance for the poor camera work
ETA: Recently came across another blacksmithing video were corn was used as fuel. The link below should jump straight to it at 4:52.
https://www.youtube.com/watch?v=GfBKfUgFFkI?t=292
And another:
https://www.youtube.com/watch?v=nZ29V8gsqwo