pitcher plant, Nepenthes ampullaria.
The tadpole of this species of frog is living in the fluid of the pitcher of Nepenthes ampullaria. This fluid contains viscoelastic biopolymers that may be crucial to the retention of insects within the traps of many species....however, the tadpole can survive well here.
Not just tadpole, some species mosquito larvae also doing well inside the pitcher.
Nepenthes ampullaria (pitcher plant).