Which rapper released the mix-tape "Acid Rap" in 2013?

Chance the Rapper

What is the name of the city featured in 'Zootopia'? Which amphibian breathes completely through its skin, having no lungs at all? What is the traditional Halloween activity of knocking on doors requesting candy? Who created the comic strip featuring the characters Charlie Brown and Snoopy? Portal is developed and published by which company?