This is the 592nd most frequent Japanese word.
冷凍
Freezing; frozen.
冷凍庫 (freezer): Here, 冷凍 refers to the process of freezing, emphasizing the storage appliance used for it.
冷凍庫にアイスクリームを入れました。
I put ice cream in the freezer.
冷凍保存 (frozen storage): In this sentence, 冷凍 describes the method of preserving food by freezing.
その野菜は長期間冷凍保存できます。
Those vegetables can be stored frozen for a long time.
冷凍食品 (frozen food): 冷凍 is used here to describe food items that have been frozen for preservation.