Knocking out method does not seem to work outside of the cave, or while out in the blizzard. Also, bring torches with you and plenty of meat, to stave off the cold sapping your strength. Would also help to kill off any dinos in surrounding area, yuty's and argies and wolf's, oh my!
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. Please if this was helpful take it to the top.