I'd recommend using the microwave to defrost further.
Other than that I'd not want to suggest an actual temperature but to state the obvious, relatively low and long from how you'd normally do baked burger.
I'd grill them so you can look and see if they are cooked.
In the oven just allow 1 or 2 mins longer than for thawed , or 1 or 2 minutes less than fully frozen same temperature 180 - 200 C.
Well a lot of food that can be home frozen comes with two sets of instructions. One for cooking from fresh and one for frozen. The temp is usually the same but you cook for longer from frozen.
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