If your yogurt has been frozen in the fridge, it should be safe to eat when thawed. Freezing yogurt is not ideal for its texture and consistency, as it can cause the liquid and solids to separate, resulting in a grainy or watery texture. However, it does not render the yogurt unsafe to consume.
When you thaw the frozen yogurt, it might be best to mix it thoroughly to try to restore some of the original consistency. The taste and nutritional value of the yogurt should remain relatively intact, but the texture may be affected.
Keep in mind that freezing and thawing can cause some changes in the yogurt's quality, and it may not be as creamy or smooth as fresh yogurt. If you find the texture unappealing after thawing, you can use frozen yogurt in smoothies or other recipes where the texture is less important.
Additionally, it's essential to pay attention to food safety practices. If you notice any off odors, strange flavors, or signs of spoilage after thawing, such as mold or unusual colors, discard the yogurt, as these are signs that it has gone bad.
In the future, to prevent yogurt from freezing in the fridge, store it in the main part of the refrigerator and not in the freezer compartment. The refrigerator temperature should be set at a level that prevents freezing but keeps perishable items cold and fresh.