両声類

Pun on 両生類(りょうせいるい) (ryōseirui, “amphibian”), swapping 生(せい) (sei, “living”) with 声(せい) (sei, “voice”): "both-voices-type".

両(りょう)声(せい)類(るい) • (ryōseirui) 

1. (Internet slang) singer who can sing in both a masculine and a feminine voice