There does not appear to be an in-game chat option in Splatoon as there is in other games like Plants vs Zombies. The in-game chat can be a problem area for younger gamers as older gamers sometimes enjoy the game and do not filter their language in games with younger players. In Splatoon, there is no worry about inappropriate language or other interactions with other gamers.
I've even found the game to be entertaining to watch. It has funky music and is very colorful with somewhat androgynous characters. My son picked a character that to me looked like a girl but he was certain that was not long hair but rather drops of ink drooping down. I have found his interactions with the game to be quite imaginative.