Hamilton Troll Meets Starlit Troll — Kathleen J. Shields

Surprise! Looking up to the sky watching ducks fly by, Hamilton sees something he has never seen before; another troll! Hamilton suddenly realizes he's not the only troll in the world. Leaping at the chance to learn more, he begs Starlit to stay for a while then introduces her to all of his friends. The next day he can't find her and he begins to worry. The search for the missing troll is only the first challenge. When they approach Hamilton's picnic, there's another surprise.