Originally Posted by Akshit Makhija

My questions are:
Do I need a COVID test to transit via germany? For India I don't but want to confirm for Germany.
No. Just your vaccination record

Will the CDC vaccination card work? Also the vaccination card has Middle initial only, not the full middle name, by standard format. Although everything else - passport, ticket and visa have exact full names.
Download the MyColorado app on your phone. You can download the official vaccination record from the Sate of Colorado.

I have booked an onward flight to bangkok, from delhi. Will that be a suitable proof of onward travel at departure check in? I hope they do not expect a return ticket all the way back to USA.
Is 2 hours of connection time at FRA enough?
Yes. Any ticket that shows you are leaving India is enough.
Yes 2 hrs is plenty.
Thanks in advance!