Do You Have To Thaw Frozen Lasagna Before Reheating It? - Tasting Table
Briefly

Thick, heavy, layered with sheets of pasta and cheese, frozen lasagna is kind of comparable to a brick - something that will take hours to defrost.
While frozen lasagna might not seem like one of the great dangers of the world, it's still important to consider food safety when defrosting.
Defrosting your lasagna in the fridge will allow it to thaw while keeping it under 40 degrees Fahrenheit, ensuring it remains safe to eat.
Whether you're using the thaw-in-fridge method or sticking your dinner right into the oven, be sure to spend the last 10 minutes uncovered.
Read at Tasting Table
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