The Big Sick

A Season 1 episode of Trolls Meet Sing TV Series

Plot
After Poppy and Branch enjoyed a feast, Branch starts to look pale green and Poppy assumes that he might be sick.

Poppy decides to play doctor with Mike. They examined Branch and his color changes to pale yellow. Poppy puts a stethoscope on Branch's heart. She also checks his temperature and says that he's got a fever.

Next, Branch turns dark brown. Poppy instructs him to cough for her. After he coughs, his color changes to bright red.

Trivia
It is revealed that Branch can change his color when he is sick.

Ironically in the first Trolls film, he can only turn grey.