The FBI has released those code words and also the symbols years before this pizzagate issue.

Here's the earliest I can get on some symbols: https://en.wikinews.org/wiki/FBI_document_reviews_symbols_used_by_pedophiles

The girl logo has been removed because.. reasons.

An fbi release on code words is harder to find. In some ways pizzagate has covered up the record on search engines. But cheese pizza has been a thing for a long time.