Spoiler alert! While we don’t know for sure who is behind the Walrus mask, the correct identity may be spoiled in the guesses below.
With so little information for fans to use as evidence, it’s difficult to say who could be behind the Walrus mask. Following fellow boy band members Joey Fatone and Chris Kirkpatrick, Lance Bass seems to be the most popular choice, with the “fish” clue hinting at his last name.
Source: https://www.distractify.com/p/who-is-walrus-the-masked-singer