I checked the Cyclopedia today and I saw this:
How can I obtain plushie of a deepling and plushie of a hydra?
To obtain those Plushies you have to use Lots.
My friends and I used around 150 lots and we got this items :).
I saw some pics of people who got Plushies from boss, but I didnt see they drop any Plushie of Deepling or Plushie of Hydra .
"There have been a number of changes made to decrease wait times between the mini-games and new rewards have been added as well – King Chuck allegedly expanded his collection of plushies..."
Probably it's obtainable in the next event (by killing the boss or using lots)
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