Without a recording, I can't be sure that what you heard was a turkey.

But, What on earth were you doing calling while scouting? Not meaning to scold, but never, never call while scouting. All you will accomplish is to educate the turkeys -- even if you get a response.

In any event, the sound you want to hear is a gobble. THAT, you will have no doubt about when you hear it.

Good luck