The Garden Sprite can be found on The Garden Gazebo and the Garden Sprite can give you a kitty!
Garden sprites are pets of Katherine de Claw.
They appear to be made from dirt, and have flowers sticking out of their head.
If you have the kitty critter, 1000 coins, and a green crystal, you can talk to them and they will do something to your kitty. I'm not giving away anymore of the secret, just try it for yourself!