What's the plural for "français", "française"?
It may be a stupid question, but is there any occasion when certain nouns don't go on plural?
I believe there is no plural for the words above, am I wrong?

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Answer

Hi There,
"
THERE IS NO STUPID QUESTIONS , JUST STUPID ASKERS " Einstein . Hahaha . 
Feel free to ask Buddy , we are here to learn .


For the masculine form it stays unchanged: 

Singular masculine = un Français 
Plural masculine (or males + females group) = Les Français 

But, Feminine isn't the case :
Singular feminine = Une française
Plural feminine (group of only females) = des françaises 

There are other words that stay unchanged, I’ll check for them and I’ll try to post later.

Take Care,

Answer

in french FRANCAIS or FRANCAISES  in plurial FRANCAIS or FRANCAISES.

a+
cecilia de france

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Hi : 
Sing Mas : Français   Sing Fém : Française 
Plul Mas : Français    Plur Fém : Françaises   +S