To be honest I've seen Ichtalid books have various success with Eternal Servant.
You would get the egg back, because the egg went from the board into your discard back onto your board again. To elaborate the Reanimate effect is considered a summoning (with special rules) so it would get the token back.
Things to remember -> The larva is a poison condition - use that Plaguemaster ability!
You can use [mwcard=DNC01]Acolyte of the Bog Queen[/mwcard]s to guarantee the damage and not kill the creature while impregnating them. You can also use [mwcard=MW1J20]Sacrificial Altar[/mwcard] to kill off your own Bog Queens and guarantee the summon (relying on your opponent is awful IMO). This helps save mana on those expensive bugs (5 mana vs 9). So the way to get more use out of the Bog Queen would be to run a [mwcard=DNC11]Ravenous Ghoul[/mwcard] to eat the corpse afterwards and gain the growth token
Value town if they let you get away with it