When you watch the Redwall Cartoon (And when I say REDWALL, I mean MATTIMEO AND MARTIN THE WARRIOR as well.)

Right after Matthias and Mattimeo get reunited, you see the slaves and friends cheering.

Well if you look near the Upper-right corner right beside Basil's leg, You can see Rollo!! I have taped this, and seen it in slow motion. It is Rollo for sure I can tell you that, same vest same scarf, everything.