A friend of my parents asked about this… he said when he was young their grandmother taught them to sing this, claiming she had learned it from a “missionary to the Chinese,” but he has been told that it’s not really Chinese and he hasn’t been able to figure out what language it is (if it is indeed a real language!)
They learned the chorus like this:
“Don-yoh tenk-wah chee,
Don-yoh tenk-wah chee,
High-low ling-tum fye-low,
Don-yoh tenk-wah chee.”
I said I would ask you smart people!