This is Season 5 episode 10 "Who Wants to Trade for Some Old Tracks". Ruff sends Emmie and Marco to learn about animal tracks, and sends Rubye and Shreya to learn how to trade things.
This is Season 5 episode 9 "The Legend of Ruffman's Gold". Ruff sends Emmie, Marc, and Jay to find gold so Ruff can replace Helga's jewelry that was accidentally covered in tar.