Thanks for doing the research. I should have checked the characters, because a Baidu search for 五毒/wudu/five poisons brings up five species of animals: snake, scorpion, centipede, toad, gecko. (https://mr.baidu.com/r/1teGKexHFVm if you fancy some MTL.)

The English Wikipedia page for Kleshas lists 煩惱/fannao as the Chinese word for it. 煩惱 is more colloquially used to mean “frustrations.”