It would be better to say what do you call that in English.
I haven't heard of "duck anoraks" before, although I know what each word is individually. An anorak is a type of raincoat, and a duck is a type of bird. A nice little bit of information; Ducks are always female, the male form of the species is known as a duke. Most native speakers don't even know that though.
I assume that a duck anorak is either a species of bird, or a person that studies ducks.
With the last sentence you gave, "Cars are have been daubed with slogans, windows shattered and..." that is indeed a grammatical error.
Student or Learner