This is a monster from the game Dragon Quest by Square Enix. The game is only playable on 3DS, Dragon Quest Heroes: Rocket Slime.
Actually this is tank not a monster ? Not so sure about it since I don’t play the game.
Known as Isamukuruma Suraringaru in Japanese, Schleiman is a slime which appears when Rocket called him using his flute.
This model requires only 4 piece of paper and designed by punipuniman100. Click on given link and look for a skydrive link on punpuniman100 website.
It will then redirect you to onedrive links which contains Schleiman pdf template.