(But here is a different explanation for owls’ silent flight: Random Engineering, Physics, ..., Concepts and Ideas - #19 by Windy_Skies)
A sci-hub search gives many results on this. An example: Reduction of Wind Turbine Noise using Optimized Airfoils and Trailing-Edge Serrations
A similar topic: Biomimicry: airfoils inspired by humpback whales, seals, and other animals
Off-topic discussion: Questions and complaints about moderation + unlisted, mostly unmoderated, free discussion - #392 by dougselsam