As in, did the Allies try printing an ungodly large number of fake Reichsmarks or lira or yen and distribute them such as dumping them from bombers or through resistance movements, indistinguishable from the real kind, to create the same effects as if their enemies were actually undergoing hyperinflation, causing civil discontent, corruption, maybe bread riots, difficulties with actually paying people and sowing unwillingness to sell things to people for fear of the notes being fake, and general chaos?
I’m not a hundred percent sure, but I think Filipinos would manipulate the market during the Japanese occupation through fake money that caused inflation
Germans had an operation to try to counterfeit British paper currency and they succeeded on making counterfeit pounds. They also almost succeeded on counterfeiting USA dollars, but the war ended before they managed to analyze everything and start producing them. Germans managed to produce approximately £130-£300 million worth of fake British money during the war.
But no fake money helps if it sits in vaults, so there were plans to use them. They were laundered and used to buy things from the black market and information, like the information that lead to the rescue of Mussolini in 1943.
There is a great film about this named The Counterfeiters (2007).
Also Japans had their own counterfeiting operation towards China and produced around 4 billion yens worth of counterfeited Chinese currency.