For taming a griff you need to be one of three things.
1 lvl 85 or above
2 have the crown skin equipped
3 have Sam last name (such as radtmir name yourself with mir at the end of it) and be at least lvl 40
When seeing these animals, make sure it respects you right before you knock it out and feed it food. if it doesn’t respect you, you can’t tame it. A tip to taming these things is to build 4-5 stone dino gates. Then, put it in a line formation with some space in between so that you can still shoot it, but it can’t escape. Then put two stone doors at the end so that there’s no way of escaping unless you open it. Once you have the trap, find a griff that you want, agro it with a mount, lead it into the trap, and close both doors. Once it’s trapped, you want to shoot darts until it knocks out. then just feed it kibble bc it takes a while to tame, and use x15 soothing balm. hope this helps!