Possibly, depending on what you meant, or how you meant to be understood by the child.
Children often make up their own role-play 'games' and they refer to these games by the name they give them, for example "lets play doctors and nurses", or "let's play mums and dads". If children wanted to role-play as Snow White and the Seven Dwarfs it is highly likely they might say "let's play Snow White and the Seven Dwarfs".
It would not, however, be an idiomatic way for an adult to say they were putting on a play. If 'Snow White and the Seven Dwarfs' were the name of the play, you would ask "do you want to perform Snow White and the Seven Dwarfs?" Also note that, when speaking about professional play productions, "would you like to play Snow White?" would mean the role of Snow White. Obviously, one person cannot play multiple roles, so 'Snow White and the 7 Dwarfs' can only really be used as the name of the entire play, otherwise it sounds like 8 roles.
I think the most idiomatic ways an adult might suggest a role-play game to a child would be:
- Shall we play a game of Snow White and the Seven Dwarfs?
- Would you like to pretend to be Snow White and the Seven Dwarfs?
- Shall we play at being Snow White... etc
- Let's pretend to be Snow White... etc