As far as I know, there is no special term.
When we refer to it, we simply say "whistle" (σφύριγμα / σφυρίζω), π.χ. "είναι κούκλα, περπατάει και της σφυρίζουν στον δρόμο".
Of course you can use any of the suggested expressions (to which I would add "θαυμαστικό σφύριγμα"), but there is no...