If you put an ice cream sandwich in the freezer, the immediate effect will be a drop in temperature. The ice cream sandwich will become colder, and the ice cream filling will start to freeze. The length of time required for the ice cream sandwich to freeze solid will depend on factors such as the temperature of the freezer and the composition of the ice cream.
As the ice cream sandwich freezes, the texture of the ice cream will change. The moisture in the ice cream will crystallize, resulting in a firmer, icier consistency. The outer cookie layers of the sandwich may also become harder and more brittle.
It's worth noting that freezing an ice cream sandwich alters its original texture and may affect the taste as well. Some people enjoy the firmer texture and find it refreshing, while others prefer the softer, creamier consistency of a thawed ice cream sandwich.
If you plan to consume the frozen ice cream sandwich, you will need to allow it to thaw at room temperature for a few minutes or leave it in the refrigerator for a longer period until it reaches a desired level of softness.