Principle Pixiefrog, is a frog, that is the principle of Charles Darwin Middle School. As a strict, but fair administrator he runs a tight ship, which is somewhat remarkable considering he could easily be squashed underfoot by most of his students and the rest of the faculty, for instance when he was forced to watch the cheerleading practice, he ended up being crushed under LaTanya Hippo's foot with the weight of the entire team. He was voiced by Maurice LaMarche.
Principal Pixiefrog always dodges lawsuits, is terrified of lawyers and is scared when anyone in the school could get sued (He is shown to have Liticaphobia). He talks similar to Windsor, only moving part of his mouth, but his voice is much louder. Adam always asks him if anything bothers him, this frog principal will always help him to see. It is also revealed that Principal Pixiefrog has a mother who bothers him. He once had a girlfriend named Lenore. After Principal Pixiefrog screamed "LENORE!", a raven flew and smacked into his window. He won the Principal of the Year award. Eventually, he was stripped of it due to a dispute and the title was offered to Principal Wolverine, a principal who temporarily replaced him once. He is known to be a strict administrator.