In large freezerproof container whisk together grape juice and lemonade concentrate together mixing well. Whisk in water.
Cover container with plastic wrap. Place in freezer overnight. Freeze until solid.
Take container out of freezer and remove wrap. With the tines of a fork, scrape mixture until light and fluffy like snow. Place fluffy mixture in glass almost to the top. Pour cold pop over the top. Insert straw in glass breaking up mixture. Drink and enjoy. Add more pop as desired. Store any leftovers in the freezer covered.