For the general chaos:
* "Blam! Bam! Crash!" - Represents the general commotion and mess that Greg and his family create while stuck in the cabin.
* "Screech! Bang!" - Could represent the cabin doors slamming shut, or the sounds of the game they play in the basement.
For the snow and cold:
* "Swoosh! Crunch!" - This represents the snow falling and the sound of footsteps on a snowy path.
* "Brrr! Shiver!" - Captures the feeling of being cold.
For Greg's inner thoughts:
* "Ugh! Aargh!" - These sounds represent Greg's frustrations and exasperation at the situation.
For the comedic moments:
* "Plop! Sploosh!" - This could represent someone slipping on ice or something falling into a bowl of soup.
Ultimately, the best onomatopoeia depends on which specific scene or feeling you want to represent.