Oh, most definitely. Vodka comes from potatos, so, sure. However, as fermentation is the enzymatic process used to produce EtOH from plant material, the most efficient feedstocks for that production would be those high in glucose. Glucose is the substrate in the feedstock that the enzymes convert to EtOH. As potatos and other veggies produce less of the least-complicated glucose per gram of material, they are less desirable feedstocks than cane, beet, or corn in EtOH production.

And, other processes would have to be added to production facilities to allow for a different enzymatic breakdown of the complex carbohydrates in other plant materials, thus using even more energy to produce EtOH.

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