Is it a standard practice for tenure and promotion committee to ask for referee reports of some published papers of the one evaluated?
Review reports as in your title: yes. Asking an outside expert in the field for comments about the published work of the candidate. This is standard practice in some places and in some fields.
Referee reports as in the question: I have not heard of that. Except maybe in the case of a paper that has been accepted but not yet published: the referee report or editor's letter may be used as evidence of the acceptance.