Whisk coconut milk, cream of coconut, and lime zest in a medium bowl. Divide mixture among ice-pop molds, leaving about 1/2" space at the top. Freeze until slushy, about 30 minutes. Stir to redistribute lime zest, cover molds, insert sticks, and freeze until ice pops are solid, at least 2 hours. Ice pops can be made 3 months ahead. Freeze until solid, then transfer to an airtight container and keep frozen.