One thing that you could do (if your desperate) is build a tiny wood cage just big enough to fit a tapejera. Once you’ve done that find a good tapejera and eat a bunch of rare flowers. It will start to attack you (Make sure that your flying on a pteradon with good health(otherwise ground creatures will attack you)) then fly into the cage and shut the door and KO that thing.

More Tapejara Taming & KO Tips