Johnny Frank Garrett might be a relatively unknown individual, or perhaps he is known in a specific local area or within a particular community. Maybe he was an ordinary person with an interesting life event that led to his name being mentioned in a certain context. But again, without more details, it's hard to elaborate on his real story.
Well, it's hard to say for sure. It could be inspired by real life, or it could be completely fictional. You'd have to look at the details and the context to determine if there's any truth to it.
Frankie and Johnny is purely fictional. The plot and characters are the imagination of the writer or creators, not based on any true accounts or real-life experiences.
It's a bit of both. Some aspects of Johnny Belinda may be based on truth, but the story has likely been embellished and fictionalized to create a more compelling narrative.