Let me google that for you
Fisrt of all you need to verify you meet the FAA requirements, in FAA land there is no such thing as a "frozen" ATP.
14 CFR 61.159 - Aeronautical experience: Airplane category rating.
You do not need an instructor endorsement for an FAA ATP checkrdie as it is considered an experience certificate rather then a training-for-certificate.
If you fail you will need an instructor endorsement.
Under 61.153 d(3) you can take a FAA checkride with a ICAO CPL so you dont even need a foreign ATP.