Can I say this?
Can I use "natty" instead of "natural" when I ask English questions?
E.g. Does it sound natty to say this?

Is it just bodybuilding slang that means not using steroid?

Question

Can I say this?
Can I use "natty" instead of "natural" when I ask English questions? 
E.g. Does it sound natty to say this?

Is it just bodybuilding slang that means not using steroid?

Answer

No, we would say natural ☺️

Answer

Never heard of "Natty," sounds like a colloquialism, but we use "Natural."

Answer

I am a native English speaker and I have never heard "natty" used. It might be only slang for bodybuilders.

Answer

Never heard it. Not sure it is any slang. Perhaps a very local thing?

Answer

Say anything you like. I would not have understood what you wanted/meant
ansy'd?. :)