Kind of. They only have 2 legs, so they're not as stable as a traditional mount, but they get up to 300 pounds and can run almost 45 mph, so their legs are certainly strong enough to carry a 120-ish pound woman slowly around a safe enclosure. It's not really practical, but it can be done.

Of course! But if you fly into another person on their mount, make sure you’re above them. Also, watch out for lava, don’t let the eggs hatch, and aim for the mouth of the pterodactyl!

Of course, havent you seen donkey kong ride an ostrich? /s