言うなって beyond the meaning [duplicate]

Question

言うなって has more than one meaning.

The case I am interested in is: Don't say that!

I am wondering about the なって part. It looks like the て-form of なる but then the english translation makes no sense anymore. "Say become".

So, is this a grammatical form that you can combine with other verbs too?

For people with a LingQ account: I am making the Attack on Titan subtitles available on the platform. The above sentence (with context) can be found here on page 8. https://docs.google.com/document/d/10cBh6DAcXgxOpwlmSFFb2oV06vgi4zRTIPhpYHUjsVA/edit The link lessen is here https://www.lingq.com/en/learn/ja/web/reader/19330600