Yes, there are rollaway beds available. Just be sure to arrange for it when you make reservations.
We obtained a rollaway bed on our last stay for $20. We had two double beds and it was my husband and our three kids so we needed the rollaway. We reserved it and it was delivered as we checked in.
I was told - no rollaways - no more than 4 people per room with 2 double beds - and extra charges for 3rd & 4th persons.
Get an answer from Comfort Inn Airport staff and past guests.