I don't have any experiences with Yhetis, so there i could give no adivce.
But about the Frostlord and Huskard "problem" i have some tipps. I have played both of them and i recommend the Frostlord on Stonehorn, because he's an absolutly Beast in combat. And not even with the Prayer can the Huskard on Thundertusk hold on to the damage output. And also the Frostlord have a 3+ save and a 5+ aftersave, so he will survive much longer then the Husakrd. And i think for this little point difference there is no reason to pick the Huskard.
But i have to say, that because i don't have some yhettis, maybe there is some synergie with batalions, abilitys etc. where it might be helpfull to have the Thundertusk Huskard.
But if you're interessted in a Beastclaw heavy list, then i recommend the Frostlord on Stonehorn. he has so much potential. And he is by far the most effective Model in the hole range of the army.