We plan to use PC (vs app) as translations of games are easier to find, there's a larger library, and the PC is easy to contain (no wifi, no dark patterns etc).
We started with Final Fantasy I (NES), but stopped once we realized its not text heavy - its mostly a grind.
So, I wanted to ask HN, which fun (and preferably, old) games you played with tons of text that was suitable for very young (4-7yr old) kids ?
You might check out the Interactive Fiction Database at ifdb.org. It's got an entry for over 11,000 text adventures that have been written over the decades, so surely some of them must be age-appropriate.
Also, here's a discussion about text adventures that were specifically written in French.
Maybe go PC-retro and try the old Sierra adventure games? Teach reading AND typing!