Mix crushed pretzels with melted butter and 2 tablespoons sugar. Press pretzel mixture into the bottom of 9 x 13-inch casserole dish and bake until set, about 8-10 minutes. Remove from the oven and allow to cool completely.
Mix together cream cheese, 3/4 cup sugar, and whipped topping in a large bowl until smooth. Spread over the cooled crust, making sure to spread completely to the edges.
Dissolve the Jell-O in boiling water and mix in frozen strawberries. Allow to set until the jello and strawberry mixture has slightly thickened and set and then pour over the cream cheese mixture. Chill until firm and serve.