And like i said. Children will often act, then talk. Or seek their words for long period of time, and when you propose a word to help them vocalize, they can accept it or reject it.
I have another example. Do you ever have slip of the tongue? You're talking about "yoga", tell yourself while speaking "i really shouldn't say 'yoda' here", and say the word "yoda" anyway? This happened to me a lot when i was younger (my speed of thought is lower those days, i don't think i slipped this way in two or three years). I still think a bit faster than i speak tbh.
The fact that you can’t find a word could be that you’re stuck in a Markov chain wall or loop:
https://news.ycombinator.com/item?id=34688673
The thing is, we just don’t know how any of that work. Our speculation is as good as any.