An ice pop is a frozen water-based dessert on a stick. It is made by freezing coloured, flavoured liquid (such as fruit juice) around a stick. Once the liquid freezes solid, the stick can be used as a handle to hold the ice pop. In 1991, when Harry Potter went to the zoo with the Dursley family, Vernon was forced to buy Harry a lemon ice pop when the lady selling them asked Harry if he wanted something.
Ice pops are also a known ingredient in Exploding Potions.