Possibly a Idiot.
They're in 30 lbs blocks, so not too many before they'd start getting cumbersome. (Also, if it's not immediately obvious, they are flammable. I don't know exactly how flammable they are in real life, but since this is D&D let's say "nearly explosive" (because that's more fun).)
I just looked it up: Whale Oil is subject to spontaneous combustion when soaked in rags and exposed to air.
This is about to get crazy.