Make a pen out of stone doorways. Then pin it down with stone pillars and put a stone hatch on top. Don't think you can quickly sneak food on him. 1 hit completely breaks any armor and leaves you with about 7 health.
Tame a kaprosuchos and swim to one of these bad boys and do it's alternate attack it will grab it in it's mouth. walk onto the shore where its safe and have another person feed it while in the gators mouth (if you unmount it drops it) it wont attack or die because it's technically not on the shore.