Yes, absolutely. You need an unbonded generator, so one with 5 connections: 3 corners, the center tap, and the frame, with no continuity between the frame and any of the other 4. Then you will only use 4 of those connections, the 3 corners and the frame, and leave the center tap unconnected.
Then if your ATS is 2 pole, you don't have to do any grounding at the generator, it's not an SDS and the solidly connected B/grounded conductor will be grounded at the service.
If your ATS is 3 pole, you do have an SDS and have to ground it accordingly, at the generator or at the first means of disconnect (if that is separate). Of course, you could choose to use only 2 of the 3 poles and connect it like a non-SDS.
Cheers, Wayne