On fjordur if you wanna tame a R-thyla just go to the red forest on asgard,They are slightly rarer than redwoods ones but the reward still better and you dont have to risk getting into that carnivore-full biome

There also is maewing and gacha's spawns so we can just say going to redwoods at fjordur is pretty much useless now

More Thylacoleo Taming & KO Tips