No. Tyga doesn't have a twin brother.
The rumor started when Kylie was seen with what they thought to be Tyga look-alike in North West's birthday party. Everyone then started speculating that the man was Tyga's twin brother.
Tyga's real name is Michael Ray Nguyen-Stevenson, born on November 19, 1989, in Compton, California. He started his music career by creating songs and posting them online, and later making mixtapes. After talking to his cousin, Travis McCoy of the group Gym Class Heroes, about his favorite performers, Stevenson went on tour with the group, traveling around the world. He released his debut album, No Introduction, in 2008, and has appeared on MTV with Fall Out Boy and Lil Wayne.
Know more the life of Tyga on Biography.com.
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Of interest, Huffington Post shares 23 Stars You Didn’t Know Were Twins.