Is it legal to make a rolling stop at intersections that have stop signs?

yes

Added: NO! That's why they're called STOP signs.

A bit more:
Think of a stop sign as a period in a sentence, not a comma. The period at the end of a sentence indicates a STOP, while the comma indicates a PAUSE. That's the same thing a stop sign does, it says to STOP, not pause. And a "rolling" stop is not really a stop.

There are hundreds of thousands of people dead and buried now because they, or someone else, didn't stop at a stop sign. Don't be one of those statistics.