... er... yeah ... no ... the "baby" Yoda was the joke part.
I dont like having to explain a joke, but ... the point being ... "Baby" Yoda would have to change his name as he grows up to something like "child" then "teenager" then "adult" etc.
You don't change a name as you grow, names are (usually) lifelong.
"Grogu" was already in the joke and dismissed as part of it - or am I missing something?