Decapodians have 3 parents?
Yeah I know! No one knows about it!
It comes from the series 3 Episode "Now that's lobstertainment" when Zoidberg says to Harold Zoid
"It's me, Norm and Sam and Sadie's boy"
They're the aliens from that TV series, 'Alien Nation'. It came out 20 years ago. It was a really good show.
Anyway, maybe the larvae stage was a toddler stage, and in the flashback, Zoidberg was in his child stage.
Also, Zoidberg says:
"Hooray, I'm a teenage heart throb again"
In Teenage Mutant Leela's hurdles.