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The SIAI-Marchetti SF.260 has seen combat
It's not a turboprop. IIRC it's powered by an O-540
T-6 is supposed to be built in an light attack version, but I do not know if it has seen combat yet.
Look up the T-6 Texan II or AT-6B WolverineCouldn't find any info on plans for a T-6 turboprop conversion - but there was a T-28 conversion (went nowhere)....
Look up the T-6 Texan II or AT-6B Wolverine