Title card.
"Switch Witch" is a Halloween-themed episode of the animated TV series ALVINNN! and The Chipmunks. It first aired in the United States on Nickelodeon on August 9, 2016.
Plot
The Chipmunks and the Chipettes must look for their Halloween candy after they get taken by a mysterious witch who replaces candy with books and fruits.
See the article on Switch Witch on Fandom's Chipmunks wiki.