What is cheater (fr. tricheur) in Bambara?
I ni ce, Malik! Next time could you provide a bit more context along with your question?
With that said, in general, a good verb for “to cheat someone” would be k’à nanbara (sometimes spelled namara). As such, possible translations for “cheater” would be derived nouns like:
- nanbaratɔ
- nanbarakɛla
You can see some of them show up in the Bambara Reference Corpus:
It looks like the most widely used in print would be nanbaratɔ 
Hope that helps!