Err.. not unless you own a PAL NES console. If you have a NTSC console that has been hacked to play PAL-A or PAL-B region games, the console will still output a NTSC video signal and probably play the games a bit faster than intended.

One needs to keep apart two things: software written for a particular video mode and hardware generating a video signal for that particular video mode. Usually you need a perfect match, i.e. if you try to run PAL software on NTSC hardware you may lose colours, the screen doesn't sync properly, things flicker and so on depending on how advanced the software is.