What actors and actresses appeared in Los chicos crecen - 1976?

You're likely thinking of the Spanish film "Los Chicos del Coro" (The Chorus), released in 2004, not a film called "Los chicos crecen" from 1976.

Here's the main cast of "Los Chicos del Coro":

* Jean-Baptiste Maunier as Pierre Morhange

* François Berléand as Clément Mathieu

* Kad Merad as Rachin

* Maxence Perrin as Pépinot

* Grégory Gatignol as Mondain

* Cyril Mendy as Le Querrec

* Tchéky Karyo as Chabert

* Marie Bunel as Violette Morhange

* Anne Marivin as Madame Morhange

* Robin Renucci as the headmaster

* Jamel Debbouze as the jailer

There is no film called "Los Chicos Crecen" from 1976. Perhaps you're thinking of a different film?