In most refrigerators, the freezer and the fridge are interconnected and share a cooling system. This means that if you turn off the freezer, it will also affect the fridge, and both compartments will stop cooling. So, the short answer is no, you cannot turn off the freezer and leave the fridge turned on independently in a typical refrigerator.
The cooling process in a refrigerator starts in the freezer, where the compressor and evaporator work to remove heat, and then some of that cold air is circulated into the refrigerator compartment to keep it cool. If you were to turn off the freezer, the refrigerator would not receive the necessary cold air to maintain its temperature.
Some modern refrigerators come with independent cooling systems for the freezer and fridge compartments, allowing you to turn one off while keeping the other running. However, these are usually found in more specialized refrigerators or high-end models.
If you have specific reasons for wanting to turn off the freezer, like defrosting or saving energy, but still want the fridge to function, you can consider using a separate small fridge or a mini-fridge as a refrigerator-only option. This way, you can control each unit independently. Keep in mind that mini-fridges have limited capacity compared to regular refrigerators and may not be suitable for everyone's needs.
If you're looking to save energy, consider adjusting the temperature settings in your refrigerator and freezer to more energy-efficient levels, and ensure the door seals are in good condition to minimize energy waste.