i’ve heard from people with skittish ducks that the best way to tame them is to find out what their favorite treat is and only hand feed it, that way they associate that people means good things and not to be scared
my ducks favorite fruits/vegetables - tomato, cucumber, romaine lettuce (never iceberg), blueberries, grapes, strawberries, and peas
but if you want dried bugs treats i recommend https://happyhentreats.com/ (you can use our brand ambassador code FATTYFRIENDS for 20% off your purchase 😉)