Using a transformer with 400 volt rated primary side with a 120 volt line
The short answer is no.

The longer answer is - only if you want tiny output currents.

This is a transformer intended for DC-DC converter use. If you go to page 2 of the data sheet, you'll see that its' intended frequency is 70 to 120 kHz. That is, it's intended to operate 1000 times faster than line frequency. That's why you can get so much current out of a small transformer. To a first approximation, this says that its' output current at 60 Hz will be limited to about 1000 times less than the rating you've quoted. Plus, since it's intended to operate in a resonant configuration, I'm not certain you'd get even that.

You're looking at a very small transformer and thinking that maybe you can get 480 watts out of it, right? Sorry, but no. Not at line frequencies.