Frozen juice can also be referred to as concentrated juice, partially frozen juice, or preserved juice. Concentrated juice typically comes in cans or cartons and needs to be reconstituted with water before drinking. Partially frozen juice is juice that has started to freeze but is not fully frozen yet. This can happen when the juice is left in the freezer for too long or if it is exposed to very cold temperatures. Preserved juice is juice that has been treated with preservatives to extend its shelf life. No matter the synonym used, frozen juice is a refreshing and convenient option to keep on hand for a quick and easy thirst quencher.