We too pronounce THOLE as you do. However, the Thole branch to whom I have made a connection pronounces it to rhyme with hole. My g-grandmother was a Thole. In her father's marriage record the name was spelled Toelle, but that may be how the recorder spelled it, because it sounded that way.
The three bothers story in the Thole family that I know, says that Johann Heinrich and his wife came on their wedding trip. The other two may have followed, or already have been here. We aren't sure. Stay in touch. We may have a connection somewhere.