A little flaky salt just before serving really makes this boozy pop sing.
In small saucepan, stir sugar and 1 cup water over medium-high until sugar dissolves, about 2 minutes. Remove from heat. Add 2 tbsp. lime zest, the lime juice, tequila, and liqueur. Pour into ice pop molds; insert sticks. Freeze until solid, about 4 hours. Unmold pops; sprinkle with remaining lime zest and flaky salt.