Okay, knightkrawler's mini-Yeti got me thinking of a couple of alternate hugs. First one is all Yeti:
Whenever a Yeti's attack causes a Hero to lose at least 1 Body Point, the mini-Yeti grabs the Hero in a powerful hug. This hug inflicts 2 Body Points of damage to the Hero at the start of the subsequent Zargon turn. The Hero cannot defend against this automatic damage, nor can he take any actions. On its next turn the Yeti must again attack and cause the Hero to lose at least 1 Body Point to continue the hug, otherwise it is broken and the Hero may act normally.
A Hero's Defend Dice become the means to break the hug using this kinder, gentler snowguy. This hug could be limited further by requiring not only undefended damage for it to be initiated, but also 2 attack results to be skulls.
This hug attack could be modified for a mini-Yeti by modifying the auto-damage down to 1 Body Point. Mini-Yetis neither sqeeze as hard nor hold on as tightly. Optionally, a minimum 2-skull roll could also be used to limit when it is initiated.
A second, alternate hug-attack would be broken with another method:
Whenever a Yeti's attack causes a Hero to lose at least 1 Body Point, the Yeti grabs the Hero in a powerful hug. This hug automatically results in 2 additional skull attack results at the start of each subsequent Zargon turn. The Hero cannot take any actions, but he may try to defend against this attack by rolling a number of Defend Dice equal to half of his starting Body Point score, rounded down. The hug is broken if both skulls are defended successfully. The Yeti can make no other attacks while hugging.
A Hero's starting Body score, a measure of his strength, determines the Defend Dice used to break this hug attack and block its damage. This would be tough, but not impossible for a lone Barbarian to accomplish. (Maybe starting Body Points should be rounded up so a Dwarf could also have a better chance.) This hug could also be limited further by requiring at least 2 skulls to be rolled for the initial attack, beyond the standard 1 Body Point of damage to the Hero.
A mini-Yeti could also use this second hug attack, but the auto-damage would only be 1 Body Point. This less daunting death-grip would make the strength check easier. I think a minimum 2-skull roll could also be used to limit when it is initiated, if desired.
A third hug attack is the simplest:
Whenever a Yeti's attack causes a Hero to lose at least 1 Body Point, the Yeti hugs and causes another 2 Body Points of damage to the Hero.
That's it. No unbreakable hug with continuing damage. It doesn't get any easier without tossing the hug attack out altogether. It could also be made less likely to occur by requiring the initial attack to also have 2 skull results.
If you're still reading, a mini-Yeti would only hug for an additional 1 Body Point of damage.