Frozen food lockers are designed for storing food items that require low temperatures for preservation. However, there are various synonyms for "frozen food lockers" that you can use to describe these types of storage facilities. One common term is "freezer storage units", which is often used to refer to a larger facility that can store large amounts of frozen food items temporarily. Another synonym is "chiller rooms", which refers to a refrigerated area within a larger building. You can also use the term "cold storage units", which, like "freezer storage units", can describe larger storage facilities situated outside of a home or business. Ultimately, the synonym you choose will depend on the context and size of the facility being described.