It’s OFFICIAL:

You can only acquire a Fenrir (lvl150) after defeating the Fenrirsūlfr (Fjourd boss) the resulting tame is delivered in a cryopod after the boss dies.

The reason Dododex say it’s a knockout tame is because if you spawn a wild Fenrir you can knock one out and tame it that way, the only down side being the Fenrir CANT spawn in the wild

The way to tame this creature is to kill the final boss on fjordur.

To tame this creature you must kill the final boss on fjordur. Everyone else is either lying or tamed the modded version. Currently, there is no other way to get one.

Fenrir's inventory acts as a fridge.

It's not a wild creature, you get 1 fenrir in a cryopod everytime you beat the end games boss of fjordur

You cannot encounter the Fenrir on the map in order to tame one you need to defeat the final boss of Fjordur wether it be gamma, beta, or alpha, to receive a cryo pod with a fenrir inside! The only way to receive a fenrir!! Up so everyone can see!

Fun fact! If you place Fenrir by a direwolf, the direwolfs eyes turn all smokey icy like.

I am not sure if this is due to a glitch in my game, but karate chop the upwards voting system if you see this too.

Defeating the Fjourd boss gives you a level 150 Fenrir in a crypod

Single player tested

It’s inventory acts like a refrigerator

The Fenrir refrigerator effect does not work on Primal Crystal.