Either find the Ferox Cave at 83.9,47.6 be careful as it is crawling with Polar Bears or go where there is always a snow storm and bring a Snow Owl,Bloodstalker, or Parasaur (Parasaur not recommended),find a Ferox using predator vision or spider vision then feed it element then grapple to a mountain and wait it out rinse and repeat, or for the Ferox cave build and enclosure large enough for the transformed version of the Ferox so it stays trapped and feed it element get it stuck let it go back to normal form and the redo it.
As of 3/28/20. Ferox will tame at the wrong level but once put in cryopod will correct to tamed level. A live 145 changed to 217 once in pod post tame. Also dododex is not accurate on x3 possibly x1. The same 145 took 20 element for full tame. At 5% per element.
Best taming method is by getting a snow owl with 6k stamina and after you gave it element freeze it till u have no stamina and it will transform back to normal without big problems. Like so other can see