I adore the `Threaded Interpretive Languages` book! It very clearly describes the internals of a real language, and variations on how to get it all done.
https://archive.org/details/R.G.LoeligerThreadedInterpretive...
https://archive.org/details/R.G.LoeligerThreadedInterpretive...
https://archive.org/details/mastering-forth-by-anderson-anit...