In chapter 385 Lucci states
You learn the name of the fruit when you gain its power
- so why did Luffy not learn the name of the Human-Human Fruit, Model: Nika after eating it?
- or did he mean you name the fruit yourself after learning of its abilities?
We see no change in his appearance besides the stretching when he is in base though which is weird. Which is different than any other zoan we’ve seen.
Like you said though, it is a minor thing.