User blog comment:Kogath/Monster Hunter Explore Discussion/@comment-35010436-20190221054858/@comment-26421638-20190221130640

Just an albino Plesioth that hurls water balls with some melee attacks.

ガノトトス激流種 is its Japanese name but i could be wrong.

Whitewater Plesioth page created, feel free to provide more info if possible.