Get Squiggling

Series about Squiglet - a monster who populates his plain white world using a magic crayon. Squiglet draws a frog called Freddie who remembers having a spell put on him, but can't remember what he used to be before he became a frog. Squiglet suggests they look for clues by the pond. They soon meet a princess and follow her to the palace, where they find out they are just in time for a fancy dress party - but what costume should Freddie wear?