My dog coughs when it has something stuck in its throat.
It whimpers when it is sad, or in pain. Crying is the same for humans.
It wags its tail when it's happy. Laughing & smiling is the same for humans.
Being feral just means uncivilised & wild, not non-human.
Not knowing societal skills, or linguistics, does not mean that they do not have human feelings.
They will still feel sad. They may whimper when they do, but they will also cry because that is the automatic human emotional response & they are still human.
No-one learns to cry. Apart from actors and manipulators, but you know what I mean.