Hokkaidō frog
Its natural habitats are boreal forests , temperate forests , temperate shrubland , temperate grassland , rivers , swamps , intermittent freshwater lakes , freshwater marshes , intermittent freshwater marshes , arable land , ponds , and irrigated land . 
<triplet> grassland <subj> habitat <obj> instance of <triplet> swamp <subj> forest <obj> subclass of