Did The People Of Hud صلى الله عليه وسلم Have Multiple Prophets?
Pharoah was actually sent one messenger, which two are you referring to? Prophet Haroon (Sws) was not a Rasool, it has always been Prophet Moses (sws).
Here Rasool is used in literal sense as a messenger of God.
Yes, could be possible. Since Harun (sws) was mentioned specifically, but in this case, we would have to make an assumption.