He was much taller ( & fatter ) than the Other Trolls - so I have two theories about that ( - & both of them are probable ) :

*Theory 1: I would have to see his parents to make sure about that - cause he might have taken His Size after Them ( which is very possible - but his parents wasn't showed )

*Theory 2: He might have eaten more than 'standard size' Trolls ( - also possible but also not showed - & both versions may be true! 😉 )

Why Biggie had the shortest Hair? 

- Because he would seem even taller if he had as Big Hair as the other Trolls - so they had to 'limit his hairstyle' not to make him look like a Giant in comparison to other Trolls :)  ( He was already 'bigger enough'!  ^_~ )

Example of him 'Being Childlish': 

- He was the only Troll who burst in tears when Chef put them into the cage ( even girls were not crying - but he had a reason! - the situation wasn't safe for them & they thought they would be eaten )

- When Poppy was talking to her subjects he shouted 'I know Her! - she's My Friend!' instead of being quiet & 'serious' at a given moment & listen to the Princess like the others did - so they had to tell him to be quiet. ( I guess he behaved like that out of Happiness & wanted to express it - but there are some moments when you should stay quiet & not say everything you have in mind - & an Adult should know it!  - Lol, seems that He didn't know! ^)^

The fact that he was so big & was going Everywhere with his Pet Worm Mr Dinkles ( Yes, that yellow thing in a top hat he was carrying all the time was some kind of a worm :) - Magical maybe, Idk ) made me instantly think of Obelix & his Little Pet Dog named Idefix! 🐶

< If you're an 'Asterix' fan too, like Me - You'll Understand it! ⤴ 😉👍 >