In the US we wouldn't use any of these. The most common phrases we use like this are: A mango can be too sweet. A mango can be sickly-sweet. A mango can be excessively sweet. or A mango can be sickeningly sweet. We can use these for describing food that is too sweet or also for a person that is overly nice and seems fake. (This is a very negative thing to say about someone.)example: "She is sickeningly sweet." Hope that helps!