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.

You can use the canon of the mek to tame it its a lot more easier

on mobile in single player with God console you can press "heal all" to fill it's hunger completely

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.

Titans do not eat anything once he is K.O just place a saddle on him and his tamed