Jmatt: Concerning Yehoshua and Calev, the ba’al Haturim also explains the event of Yoseph calling the brothers spies in a similar way.
Yoseph called the brothers (miraglim) spies told them that they would produce the bad miraglim, while he would produce Yehoshua. Yehuda answered that they are not spies was his way of saying that he would produce Calev.