Ptychadena stenocephala
Its natural habitats are subtropical or tropical moist lowland forest , moist savanna , subtropical or tropical seasonally wet or flooded lowland grassland , subtropical or tropical high-altitude grassland , swamps , and intermittent freshwater marshes . 
<triplet> savanna <subj> grassland <obj> subclass of <triplet> grassland <subj> habitat <obj> instance of