If it won’t allow you to feed it, knock it out and let it wake up then try again. Most likely due to the fact someone else tried to tame it before. Also, it tells you when to feed it at the bottom corner of your screen.
I was just walking around with my giga for getting meat when i saw one of them infront me i rushed to base to get my quets and took it to my base and tame it it took 3 griffin kibble with 10 balm but it was worth it
Passive tame,only want griffin kibble (mobile), if you by chance find it, build a pen until you have the kibble, DON’T TRY to enter any cave until you tame it, as it can be gone from your pen after you come out from any cave.It HAPPENS to me 3 times.sad.