User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.193.207.22-20130106164712/@comment-3211692-20130107214147

The Jade Barroth covering itself in ice would function similarly to an igloo, insulating heat and keeping it warm. It doesn't have the same armor effect as the Agnaktor, after all, and since the normal Barroth uses mud to keep cool, presumably the Jade one has a similar-but-opposite purpose.