Yes. They serve warm meals on the flights to/from Ontario (YYZ and YOW). Also, in Whitehorse, you can buy those meals frozen at the Independent supermarket and directly from Air North.

On the other flights operated with Boeing 737 they serve a sandwich or a platter (yummy charcuterie), plus a warm cookie.

I'm not sure if/what they serve on flights operated with prop equipment (small airports North of Whitehorse).