for/from a little boy

[azz]

a. That is bold talk for a little boy!
b. That is bold talk coming from a little boy!
c. That is bold talk, coming from a little boy!
d.That is bold talk from a little boy!
e. That is bold talk, from a little boy!

Which mean
1. That is bold talk and it is coming from a little boy.
and which mean
2. That is bold talk when it is spoken by a little boy. (It wouldn't be bold if certain other people said it)
?

In the famous western movie 'True Grit' one character says: "I call that bold talk for a one-eyed fat man'. The meaning obviously is that it wouldn't be bold talk if it came from certain other people.

"i call that bold talk" - Google Search

 

[Tarheel]

"That is bold talk coming from a little boy."

That one was probably doing what used to be called backtalk -- something that could get him a spanking. (Or maybe sent to bed without supper.)

I don't know what the one-eyed fat man said, but it was probably fighting words.

 

[Barque]

Which mean
1. That is bold talk and it is coming from a little boy.
and which mean
2. That is bold talk when it is spoken by a little boy.

All your sentences except sentence e seem all right.

They all mean the same thing. Considering it's a little boy who's saying it, it's bold talk.

It may or may not be bold talk if an adult says it. We don't know what the boy said.

 

[5jj]

I don't know what the one-eyed fat man said, but it was probably fighting words.

He threatened to kill the criminal or take him in for trial.