A bunch of Buffalo is called a "Gang", a bunch of Wild Cats is called a "Destruction", a bunch of Frogs is called an "Army", and amusingly enough a bunch of Skunks is called, and I kid you not, a "Stench".
Iowa refuses to tolerate Fake or Imitation butter to the point where it cannot be called "Butter" or described as such, nor are you allowed to use any words like "butter", "creamery", or "dairy" even or even put cows on the packaging.
In short, Iowa just won't stand for anything but the real thing.
Amusingly enough in Wisconsin actually has a state statute in Wisconsin statute 97.176 "Butter; grading label" which reads:
"(1) It is unlawful to sell any butter at retail unless it has been tested by industry experts and issued a grade" which is why you won't find Kerrygold butter because it is made in Ireland and the Wisconsin state government actually sent a State order to Kerrygold to stop sending them "illegal goods" in 2015.
Since then two lawsuits have been filed against the state over the matter of Irish Butter.