The sentence below is from a book. Is there any difference between sound and sounding. I mean, I don't know why it says, sounding. I think "strange-sound" is good enough.

It was awkward and strange-sounding, and elicited much more attention than the original lisp.

Thank you,

And to use 'sound' you would have to recast the sentence:

It was awkward and strange-sounding...

It was an awkward and strange sound...
"Strange-sound" the sound is a noun.

In the sentence you've given, "strange-sounding" is an adjective.
Students: We have free audio pronunciation exercises.
 Mister Micawber's reply was promoted to an answer.
Thank you very much, people!