flavored milk
Milk that has an added flavor mixed in via a flavoring, usually via a sugary powder or syrup. Flavored milk are usually colored thanks to food colorings.
Chocolate milk (colored brown) and strawberry milk (colored pink) are by far the two most familiar flavored milk beverages, though other flavored milks exist including vanilla milk (which is hard to tag here since it's usually the same white color) and coffee milk (which is tannish).
See also
This tag implicates milk (learn more).
The following tags implicate this tag: strawberry_milk, chocolate_milk (learn more).