Singular  Plural 
banjo banjos/banjoes
archipelago archipelagos/es
cargo cargos/cargoes
desperado desperados/desperadoes
halo halos/haloes
lasso lassos/lassoes
mango mango/mangoes
memento mementos/mementoes
motto mottos/mottoes
tornado tornados/tornadoes
volcano volcanos/volcanoes
zero zeros/zeroes