I think Yoda's Jedi master should be a Wookiee
They naturally have long lifespans, so a wookiee would be well suited to care for a species who ages slowly
Just imagine itty bitty baby Yoda in the arms of a giant fuzzy wookiee
This Wookiee Jedi could have introduced Yoda to other wookiees and brought him on trips to kashyykk
Oh, and since Yoda was born in 896 bby, it's possible for this hypothetical Wookiee Jedi to have encountered and fought the old sith passing on stories of them to Yoda
This also could explain Yoda's speech patterns
If you don't know, some languages, if you translate them literally, come out in english as "Yoda speak" as my Latin professor put it
So what if that's how Shyriiwook (the wookiee language) works?
When you literally translate it, you get Yoda's speech pattern, and that shaped how Yoda speaks in basic