I like the answer above, but I'll add mine: I don't think it's possible. There's probably some hack or cheat, but I wouldn't recommend trying. I doubt it will work.
You can only get a free mount when you buy a station cash card. Some cards have a rare code, and that code gives a green dinosaur with red and yellow dapples. But, it's really rare, trust me I have...
Free Realms is free, or mostly so, but the membership is not free. And if you want more SC, or higher levels in jobs and such, you have to pay. These things are free after you sign up on the game:...