If both continental Polar and continental Tropical air masses meet does it cause a tornado?

No. If conteinental tropical and continental polar air masses meet, they will form a front. Storm activity would be limited due to the relative lack of moisture. If a continental polar and maritime tropical air mass meet, then thunderstorms are possible. The collision of air masses does not directly result in the formation of tornadoes. Instead, the collisions result in thunderstorms which, if a few other conditions are right, may go on to produce tornadoes.