Massively's guide to the LotRO vanity pets: Friend of Turtles
From here, Radagast will be so glad you saved the little bunny, that he'll give you another quest entitled Friend of Turtles. It's a very similar quest as you'll need to find the Turtle located in the northwestern part of Agamaur, hidden within the ruins. You can take your original route through the Eglain encampment, but this time veer west towards the pools of water. Follow the shore until you reach the end of the wall beside you, then edge north a bit, moving through the wall cracks. The Turtle is behind a group of ruins, along a line of low pillars. You'll find him hidden in a little tree stump in the corner.
Again, use Radagast's scroll on the Turtle to call him out and quickly escort him back to the wizard. This one is also timed, and five minutes isn't a long time when you're running through groups of Shades, Ghouls and Eglain.