Foetid (fetid is actually the more usual spelling, but I think the o makes it look even knobblier) is a word with a built-in scowl.
No, really: try it and see. Saying foetid makes you look as if you'd smelled some really REALLY revolting.
Like...but, hey, I don't want to put you off your biscuit.
Still, stinking is as stinking does. The plant foetid bugbane lowers fever, kills pain, and is a sedative, a tonic, anti-viral and anti-biotic. It treats rheumatism, coughs, colds, headaches, gum disease and, oddly, measles.
And smells of decaying fish.
Ah, but the toadstool Amanita foetidissima may smell disgusting, but at least it's edible.
If you're desperate...
As for the buffalo gourd, Cucurbita foetidissima, not only can you eat it (as long as it's young enough not to have developed too much taste) but you can make it, bizarrely, into rattles.
I don't know, though: I think I'll stick with aspirin, mushrooms, and not-rattling, though, all the same.
Word Not To Use Today: foetid. This word is from the Latin word fētēre, to stink, and is related, rather satisfyingly, to the word fūmus, smoke.