Whiskey is usually made from corn and/or other cereal grains. The only alcohol that I know of that is made from potatoes is some vodkas. Vodka, to my knowledge. You're probably refering to the Irish moonshine known as Pocheen (poo-cheen). This has been illegal for a number of years due to it's potency however there is now a weaker version available on the commercial market.
Potcheen (Poitin), Irish moonshine, is distilled from potatoes. Since legalization two distilleries are now licenced to make it. Some versions of vodka are purported to be made from potatoes although the majority of vodkas worldwideare made from distillation of grape wine or a grain MASH. And vodka is not a whiskey.
Potatoes, when fermented and distilled, will produce a neutral spirit which can then be bottled as vodka or whisky, such as the infamous strong Irish drink, potcheen.
From Wikipedia: BrennivÃn(Icelandic pronunciation: [ˈprÉ›nËɪvin]) is a clear, unsweetened schnapps that is considered to be Iceland's signature distilled beverage. It is made from fermented grain or potato mash and flavored with caraway, cumin, angelica, and other botanical ingredients
potcheen
Vodka is distilled from potatoes.
destillery
mashed potatoes and whiskey
It is called tequila because it is made from parts of a particular cactus plant. Alcohol made from potatoes is called vodka.
Yup. And whiskey.
whiskey
Drambuie?
potatoes, whiskey, jewelry, beef, poultry, ect...
It is called "Canadian" whisky, made mostly with rye.
Irish whiskey is whiskey made in Ireland or Scotland that doesn't meet the requirements to be called "Scoth"which has a fairly strict set of requirements to carry the name on their drink. Many Irish whiskeys are blended with whiskeys not allowed in Scoth and use ingredients not allowed in Scotch. A Whiskey made in Ireland would also not be allowed to be called Scotch. The names are sometimes traditions but in other cases they are legal tradnames.
A blockade whiskey is any form of illegally distilled whiskey, or any home-made liquor, made legally or otherwise.