Set temperature of freezer as low as it will go. Soak 10 wooden pop sticks in warm water for 10 minutes.
Drop strawberry slices into each cavity of a 10-pop mold, bending them so they won't clump. Blend mango and sugar in a food processor until smooth. With machine running, pour in nectar.
Pour mango mixture over strawberries to fill each cavity. Poke with a skewer to release air bubbles and distribute berries. Place top on mold and add sticks. Freeze for 8 to 12 hours.
To remove pops from mold, run top under tepid water to loosen, then swish bottoms in a basin of tepid water until loose. Pull middle sticks to remove top and all 10 pops. Store pops in ziplock freezer bags.