I can see I am going to have to get technical with you here.
From the Merriam-Webster Dictionary.
Definition of TEAL BLUE
: a dark greenish blue
It comes from the teal duck. There is the blue winged and the green winged teal.
The fingernail polish you portray, borders very nearly on being aqua. It's a toss up whether one would call it aqua or teal. I would call it a pastel teal because it seems to have just a touch of gray in it. True teal is a dark color, not a pastel.