Instead of saying "He died. - Li mouri." Is there an expression similar to "kicking the bucket", "bought the farm" in Creole?

Sure :)

to have died
al bwachat
ale nan peyi san chapo
fè vòl pou peyi san chapo (or fè vwèl pou peyi san chapo)

Peyi san chapo (lit: country with no hat)

L'al bwachat.
He/She died.

Li fè vòl pou peyi san chapo.
He/She died.

L'ale nan peyi san chapo.
He/She died.