This is the 896th most frequent Croatian word.
kakve
"What kind of"
In this sentence, 'kakve' is used to inquire about the description or characteristics of the tracks referred to.
Nisam vidio kakve tragove na tlu.
I didn't see what kind of tracks were on the ground.
Here, 'kakve' indicates querying the nature or qualities of the pictures mentioned.
Želim vidjeti kakve slike imaš.
I want to see what kind of pictures you have.
The word 'kakve' is used here to ask for a description or quality of the books referred to by the question.