Does a neutral-to-ground voltage of 0.0 indicate a bootleg ground?
The best way to check for the bootleg ground, is to open up one of the boxes and look at how the receptacle is wired.

Since the grounded (neutral) and grounding conductors are bonded at the service equipment, they should always be at about the same voltage potential.  If you had a long circuit, and an accurate meter, you might be able to measure a slight difference.

Since wire has a resistance, it's certainly possible to measure a voltage difference. However, a reading of 0 volts, does not necessarily mean there's a bootleg ground. The only way to know for sure, is to actually inspect the wiring.