From what we understand, F&W booths will not be exchanging the QS for 3 snacks, but it hasn't started yet, so we don't know for sure. Just remember, you would have to get 3 from the same country, and some only have one offering. My suggestion is, it never hurts to ask.
However, the F&W offerings are THE best value for a snack credit in all of WDW, so if it is allowed, you're trading down, IMHO.