Karius and Baktus are the tooth trolls created by Norwegian author Thorbjørn Egner for his 1949 children's book, later brought to life in Ivo Caprino's beloved 1954 puppet film. Living in a young boy's mouth, the pair celebrate sweets and neglect while causing toothache, making them memorable villains in a story about dental care. Generations of Norwegian children grew up with their songs and laughter, and clips from the film still circulate online as nostalgic references. Their giggle endures because it instantly signals cheeky, old-fashioned mischief.