Agro it and lead it to a cliff and shoot it from there you can't trap it to tame it. If the cliff didn't work have a quetzal ready with a cannon. And fly ahead of its head and fire at its head (must be hit in the head to tame) and once it is knocked out put a saddle on it to tame ( only last 16-20 hours so be ready to do something with it
You hit it with cannons on a quetzal. Go for it’s head. It’s torpor won’t drain either so take your time. They can’t eat just stuff a platform saddle on the titan once KO’ed. You use daedons to heal it when it’s food level is low.
If you try taming these guys, tame a Quetzal first and equip it with a platform saddle. Then, put 2 storage boxes on it and a cannon. Make sure you make LOTS of cannon balls. Then, shoot the titan in the head.