Heat oven to 350°F. Line large cookie sheet with cooking parchment paper.
Crush, process or blend each of the pie fillings until semi-smooth and spreadable.
Unroll pie crusts. Spread each flavor pie filling onto each of 3 crusts. Top each with 1 remaining pie crust, gently pressing to seal. Brush beaten egg evenly over top of each; sprinkle with their matching color sugar crystals.
Cut each filled pie-crust stack into 1-inch-wide strips. Cut each strip once crosswise so “fries” aren’t too long. Place in single layer on cookie sheet.
Bake about 20 minutes or until light golden brown. Remove from cookie sheet to cooling rack. Cool.
Meanwhile, in each of 3 separate bowls, stir together 1/2 cup of the powdered sugar with a few drops of water, stirring just until thick. Leave 1 bowl with white dipping glaze. To make blue and red dipping glazes, stir a few drops of blue and red food color into each of the 2 remaining glazes.
Serve “fries” with dipping glazes.