Yoan Moncada of the @whitesox joins this list:

Players 22 or Younger w/ Leadoff HR in Back-to-Back Team Games - All-Time

Paul Molitor, Mil (1979)
Oddibe McDowell, Tex (1985)
Ramon Santiago, Det (2002)
Hanley Ramirez, Fla (2006)
Mike Trout, LAA (2012)
Yoan Moncada, CWS (2018)

— OptaSTATS (@OptaSTATS) April 27, 2018