When you're refrigerator, you'll spit out health-replenishing food items. Hit B to change back into Kirby and pick them up.”
— Description • Nintendo Power (Volume #134)
Refrigerator is a mix ability that only appears in Kirby 64: The Crystal Shards. It is obtained by mixing the Ice and Spark abilities. With this ability, Kirby is able to transform into a refrigerator, and can attack by launching food at enemies, but he can also use the food to restore his own health. If the enemy runs into the food, both the enemy and the food will be destroyed. The same thing happens when the food collides with a wall. Kirby cannot move while he is in his refrigerator form.
In Kirby Star Allies, Refrigerator is referenced as part of the Artist ability; it is one of the paintings that can be made using the ability. When painted, it will release food, as it does in Kirby 64: The Crystal Shards. 
Kirby becomes a refrigerator. He then fires off 3 food items that damage enemies and can be eaten for health.
Refrigerator and Melting Ice Block are the only Ice combinations that do not freeze enemies.