What is the answer for question 19 in The Impossible Quiz?

Solution 1:

BOGGY stands for colors on the paint buckets. Each time you put in a color, a portion of his face will be colored in. B is Blue, G is Green, Y is Yellow and O is Orange.

Solution 2:

The riddle is simple. Do you see the word Boggy underneath that creature? These letters represent the colors of the paint buckets that you need to click in that order. B for blue, O for Orange, G for Green (x2) and y is for yellow.