There is in fact a theory that language is a tool for thought first, and for communication only secondarily.
Take for instance Google's translation AI. It developed its own intermediary language which facilitated translation between languages and enabled it to even translate languages it had not specifically been trained on.
e.g. It had a "word" for dog that wasn't part of any existing language.
e.g. it could translate Spanish -> French even though it was only trained on Spanish -> English and English -> French