You mean the Scribblenauts ponies? No, I drew those in Photoshop. But I have tried Scribblenauts Unlimited for the Wii U, where you can modify objects, so who knows? I'm sure people have tried making more show-accurate ponies in that game.
I saw the sketch you did for *TheDescendantofKehAn, just wanted to say how much I love it. The way Spike uses Twi's leg for a blanket is the cutest sight.