I have done that a few time.
Yes, you do go through immigration, but it is in transit so you do not leave the sterile area.
FRA is a horrible place to connect though! Worst airport I have been through in over 150 airports.
We had an hour there on a revenue ticket and BARELY made the flight. Our luggage did not however...
The departure tax is high also, at over $100.
Can you go through AMS?
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