Landorus may be a good option, but I don't know about Terrakion. I understand that he is a really good Poke to Chomp's checks, but having 3 Physical Attackers isn't the best, IMO (I am assuming Chomp is going to be a Physical Attacker). Honestly, I think he should have a Physical Wall oppose to another Attacker, and IMO, Gliscor is a good option, as he benefits from the Sand. Even though, Terrakion isn't a bad choice, as he is pretty bulky on both ends. But then, he has to use a Poke that can get rid of Ground Types, as they will destroy him, as can be said about using the Gliscor & Chomp combo against Ice. Also, I do agree with others that Aegislash or another steel type would probably be a good option to deal with Ice Attacks, even though Aegislash is also yet another Physical Attacker but has great defenses.