The Chinese giant salamander grows up to 1.8m long and only has to eat once a decade. That most surely be in the running.
It’s technical name is Andrias davidianus- maybe you can do something with that?
http://www.arkive.org/species/GES/amphibians/Andrias_davidianus/
My question is…do you think people who will use the software will know what you’re talking about with the name? Or will it be one of those explaining-the-punch-line sort of things?
It may not be what you want, but don’t cicadas spend up to 17 years dormant?
Then they emerge en masse, pig out for a few weeks and go back again.
Some species of cicada spend 17 years as immatures feeding below ground (not dormant). Then they dig out and molt into adults.
Well, no. The adults spend almost all their time looking for mates, then die after laying eggs. They don’t re-enter the soil.