Joshua and Caleb were two important figures in the Bible who are mentioned in the book of Numbers. They were both among the twelve spies who were sent by Moses to scout out the land of Canaan, which God had promised to the Israelites.
According to the Bible, Joshua was from the tribe of Ephraim, while Caleb was from the tribe of Judah. So the answer to the question is: "Judah and Ephraim".