Preheat the oven to 375 degrees F (190 degrees C).
Combine pretzels and sugar in a bowl; stir in melted margarine. Mix until evenly incorporated and moistened; press into the bottom and sides of a 9 inch pie plate.
Bake in the preheated oven until edges are lightly browned, about 5 minutes. Cool on a wire rack.
Combine sweetened condensed milk, limeade concentrate, tequila, orange liqueur, and green food coloring in a large bowl until well blended.
Beat cream in a separate glass or metal bowl with an electric mixer until soft peaks form. Lift the beater or whisk straight up: whipped cream should form soft mounds rather than a sharp peak. Fold whipped cream into condensed milk mixture. Spoon filling into cooled crust.
Cover pie with plastic wrap; freeze until firm, about 4 hours. Let stand at room temperature before serving for 10 minutes; garnish with lime slices. Christina
Frozen Margarita Pie · Dinner Match Lab | Dinner Match Lab