Yes. My nieces have while in the 8-13 age range.
It shouldn’t be a problem.
There are a handful of mocktails listed under some bar menus somewhere in the app but they’re not frozen. For frozen, it will be daiquiris in several flavors (I know I’ve seen strawberry, mango, & tropical), pina coladas, miami vice, etc.
People start threads asking for favorite mocktails every so often so you may find one by searching… or try googling. If they have the ingredients, they will make it.
One hack that works well, especially for mocktails… bring a banana from WJ to a bar & ask them to add it to a virgin strawberry daiquiri. Makes it even more like a smoothie.