Zeps are creatures living in Nordor. They look small and fuzzy, but they are actually robots, and can transform into become bigger ferocious Anadroids.
The New Adventures of He-Man
The first Zep to appear was one being pursued by Grr. When Skeletor and Quakke go to retrieve Grr, they find a power-up crystal hidden on the moon Nordor.
The Zeps' first major appearance was in the episode The Gift, where they are the titular gift given by Flogg to the people of Primus as a peace token, but this is actually a trap, as the Zeps take their bigger forms and help Flogg take over Primus.
The Anadroids remain part of the Mutant army throughout the episodes of the Mutants having control of Primus, until the Scientists of Primus find out that mud can short circuit them.