One possible word is drawl.
They are called mutes.
Charlatans.
Therapist
People with schizophrenia may talk a lot. If they talk a lot without making much sense, this is called "schizophasia".
Animal Communicators?
autism
Conversing, conversation, dialog.
the word is shy
talk slowly and do what you have to do to keep contact
It's called communication. No talking, no communication.
An Elephant Called Slowly was created in 1969.
talk quietly talk slowly talk fluently talk clearly talk loudly talk openly talk secretly This is not all there must be many more