Use ghillie armour to feed him. Dont walk too close to them or they will hit you and you will lose your taming progress. Just give them space. Another good way to tame them is to make them mad and lock them up in a cage 1x1 with a hatch as roof then get him in there and get in the roof and feed him!
Easy to tame, just sneak and bring one soothing balm and berries but i prefer mejoberries. If your looking for one of these go to the redwood forests and you might find one just search for it, but becareful the terror birds might attack you or purlovias the sneaky rat. (Up if this is helpful)