Put frozen juice concentrate and cold water into a pitcher. Stir until combined.
Add four scoops of sherbet and stir until melted.
Pour in about two cups of lemon-lime soda
To serve, put one scoop of sherbet in each glass. Fill the glass halfway with sherbet punch mixture. Add lemon-lime soda until the foam reaches the top of the cup. Serve immediately.
For optional garnish, add wedges or slices of fruit.