If the rec don't survive neither does YGG... in fact you add recs to him most cases precisely so he'll live long enough to perform the suicide. Don't think there is a single AliB adv where a lone YGG can actually perform a suicide against First Strtikers as there are usaulyl enough kill him him first.
Anything the YGG survives, Frosty survives better, he has more HP, enough more HP that he can suicide many camps the YGG cannot alone. Without Flanking ofc the value of that suicide is questionable.
So far I use Frosty for suicides where I'd use bowsuicides to shave of main loss before, often YGG does those no, but maybe don't need as much dmg.
I don't quite understand the question about bears. Frosty kills bears same as YGG does, just fewer since he has roughly half the dmg capacity.