Justin Timberlake had “Trolls.” Rihanna has “Smurfs.” Now, we patiently await a “Gummi Bears” with the Biebs. But first we ...

Justin Timberlake had “Trolls.” Rihanna has “Smurfs.” Like “Trolls,” “Smurfs” gets as much mileage as it can from its pop singer-voice actor.