Here are a few-frog and some lizards. There might be more on some of the other free pages.
The link is an old post when I was looking for a turtle. Hope you find what you need.
I have a couple, if you are still looking.....make sure you scroll the the bottom of the link as dragonflies and dragons are both in this link....Sorry, I didn't read this well enough, I thought I saw dragon, not dinasaur...these won't help you.......good luck in your mission......
Looked through all of mine but have nothing like that so unable to guide you in that direction. Perhaps one of digitizers on cute could do one for you. Martine(mops) comes to mind. She is very good at large designs and you are just wanting a quilting stitch right? Good luck /Lillian