(Συγγνώμη, Ανθοδοχούλα μου, μα "βατήρας" μου φαίνεται σαν "diving board." Να ψάξεις "jump-rope" στο YouTube να δεις--εκτός αν αναγνωρίσεις τον όρο "σχοινί άλματος," βέβαια! 👁 Wink ;) )
If this is what we are talking about, then σχοινάκι or σκοινάκι is indeed what it's called in Greek.
A search for σχοινί άλματος only gave references to machine-translated texts (I mean, word for word it is correct, but I have never heard it called that - never trust machine translations completely! 👁 Smile :) )