Fluorescence versus phosphorescence
If it is so, then why do we call glowing objects in the dark as fluoroscent?


I think this is just marketing: most people have heard the term fluorescence, while phosphorescence or luminescence are largely unknown terms.

While a delayed emission from a singlet state is possible, most glow-in-the-dark items do in fact show phosphorescence, i.e. emission from a tripet state.