Definitely not! The cultural importance of potatoes in Sweden cannot be overestimated. Potatoes made it possible for the population to grow in the 19th century in a way that drastically changed the course of history.
The use of potatoes for making vodka has also had a huge impact.
To get Are the potatoes tasty you would have to use Swedish goda or smakliga (goda is the more common one).
Är potatisarna goda? - Do the potatoes taste nice? Are the potatoes tasty?
Är potatisarna fina? - Are the potatoes in good condition for eating? Do the potatoes look nice?