Mr. Seedplot

Archibald Philip Seedplot: Is Phoebe's old teacher from her old school. He first appears in Goes to Seed, where he picks Phoebe's plant to bring to her new school.

Trivia

 * He has a crush on Ms. Frizzle
 * Ms. Frizzle has a portrait picture of him framed in her house, possibly suggesting that they're closer than friends