Played by Cory Michael Smith, Nygma, of course, began his time on Gotham as a meek forensics expert at the GCPD.
Penguin returned to Gotham, though, leading the two on a collision course that ended with Nygma frozen in a block of ice by Mr. Freeze.
When asked how being frozen would effect the Riddler in season 4, Smith told the following to Cinema Blend.
Without his intelligence, Nygma definitely can’t be the Riddler anymore, and since he bases so much of his personal self worth on being smart, it’s arguable that he can’t even be Edward Nygma anymore.