No, ice cubes do not sublimate in a freezer. Sublimation is the process in which a solid directly converts into a gas without going through the liquid phase. In the case of ice cubes, they are already in the solid state, and when placed in a freezer, the temperature remains below the freezing point of water, which is 0 degrees Celsius (32 degrees Fahrenheit).
In a typical household freezer, the temperature is set to keep the contents frozen, including the ice cubes. The freezer creates a cold environment that allows the ice cubes to remain solid and maintain their shape. However, over time, some ice cubes may undergo a slow process called freezer burn, which is the loss of moisture from the surface of the cubes. This can cause the ice cubes to become dehydrated and develop a frosty or shriveled appearance. But it's important to note that this is not the same as sublimation.
If you're observing the ice cubes in your freezer disappearing without melting, it could be due to evaporation caused by a lack of proper sealing or exposure to dry air. In such cases, the ice cubes may shrink in size as the water molecules slowly evaporate.