Break pretzel twists into small stick-shaped pieces for arms. Set aside.
Gently twist each Nutter Butter cookie to separate the halves. Dip one end of a candy stick (about 1-1.5 inches) into melted white chocolate and press it into the peanut butter filling. Place the other half on top and press together. Let stand 10 minutes to set.
Melt white candy melts in a microwave-safe bowl at 50% power for 1 minute. Stir, then continue heating in 30-second intervals until smooth.
Using the stick as a handle, dip the entire cookie into the white chocolate, coating all sides. Tap off any excess and place on parchment paper.
While the chocolate is still wet, sprinkle sanding sugar over the cookie for a snowy sparkle.
Add two candy eyeballs near the top of the cookie. Place a small orange sprinkle just below for the carrot nose.
Press two pretzel pieces into the sides for arms.
Add three pearl sprinkles down the lower half of the cookie for buttons. Let stand 10 minutes to fully set.