Preheat oven to 425 degrees Fahrenheit. Line two baking sheets with parchment paper.
In a large bowl, mix together flour through salt.
Slice butter into chunks and use your hands and fingers to blend it into the flour mixture. (This may take a few minutes!)
Add the vanilla yogurt and use a wooden spoon to stir until just combined. Add the frozen blueberries and stir until they are just combined as well.
Place about 3 tablespoons of sugar onto a plate. Scoop out scones using 2 spoons. Dip the top into the sugar and then place onto prepared baking sheet.
Bake for about 12-14 minutes, or until golden brown. Cool on a wire rack. Enjoy!