Here's what I do to scent prey items and it has worked for me very well...
Get your hands on a toad, road killed or euthanized, and put it into a deli cup. Cover it with the lid and put it into the freezer. Whenever you need to feed a problem snake (such as a hognose) take your deli cup out of the freezer and put it into the microwave for a few seconds, I do for 10-15. Keep the lid on. You only want to put the cup & toad in the microwave long enough to get it a little moist and musty inside. Next, take it out and place a live feeder mouse into the cup, close the lid and let the mouse move around a little in there for a few minutes. The musty scent and moisture will get all over your feeder. This has worked great for me with scenting domestic mice and rats with lizards or natural rodent prey species to entice WC snakes to feed. I imagine it will work for toads too. I have used one scent item probably a hundred times and had it sill work.
It will probably work better with offering live prey first. If your are feeding subadult or adult hognosed snakes try a fuzzy or pinky then move onto a prekilled mouse, all scented in the same fashion. If you are feeding babies of course start off offering scented pinkies.
Hope this helps!
Greg Knoell
www.thecoloreddragon.com
www.thecoloreddragon.com