It starves after 16-24 hours since u cant feed it. So why would you bother taming 1? Because they are walking bullet sponges and can damage metall structures. Excellent for raiding or transporting huge amounts of mats safely.
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.