Oh wow 3 people all ready. Ok, the winners are:
themysteriousauthor
_Queen_Of_Fire_
Annabeth_Chase_20
The answers:
1) jessica, hiccup
2) because he ate her chocolate (and BC of Astrid)
3) cuz he jellyyyyyy (jealous of hiccup)
4) to make hiccelsa jealous (also so that everyone's happy in the world of fandom, but oh well lets go with to make them jealous :) )
5) my friend came up with this: NARWHAL PEOPLE....... Maybe not........ Ill think more on it