creatig shortcut icon from apps downloaded and visible in Task Manager

[AC Question]

Dear Android Central,

I have been cleaning my Samsung Android phone.
I see some apps, like WhatApp in the downloads from the Task managaer.
I can't creat ea shortcut on my homescreen. I can't seem to open WhatsApp. They are not visitble in the Google Playstore, looking at My apps&Games.

Hope you have an idea.

Wendy