The Ferox is a cool little creature that turns into a monster. You can find the Ferox in the Artic Biome of Ark Survival Evolved Genesis Part 1 dlc. Right now there is a Ferox cave where you can find the little guys and a lot of Polar Bears too. It is located right by the Searching the Frozen Zone mission at 70.8 26.2 . There are tons of Ferox spawns there, and I wouldn't be surprised if they nerf the Ferox Cave soon. If they do I have found a few locations where the Ferox spawn in the open. They are in eastern section of the Artic Biome where there is a constant blizzard.
Free Roam Ferox
80.8 43.6 61.6 50.4
Cute freshly tamed Ferox at the Ferox Cave in Ark Genesis
Good luck taming, a Ferox, the only thing hard about it is not getting killed by all the dangerous creatures or freezing to death. One or two darts will knock them out and feed them a few berries, and they are yours. You can also passive tame them, which is just a waste of element.