The French translation for “mincing knife; rocking chopping knife” is couteau à bascule. The French, couteau à bascule, can be broken down into 3 parts:"knife" (couteau), "at" (à) and "seesaw" (bascule).
Examples of "mincing knife; rocking chopping knife" in use
There are 2 examples of the French word for "mincing knife; rocking chopping knife" being used: