Failure
Defeat
A shellfish that can't live through winter is a failure. Any proper shellfish would survive through the winter, so this is quite an embarrassing defeat.
はい
やぶ
None
The best way to avoid failure is to say a little haiku (はい) to distract you from the cold. In fact, this can work in any situation where you're afraid of defeat. Say a haiku aloud, it will calm your nerves and warm you from the inside.