This is Gastrotheca nebulanastes, an Andean Marsupial Frog. In addition to being adorable, this species, in fact this entire genus, has a pretty cool attribute. Unlike the "conventional" amphibian; one that lays its eggs in water, undergoes an aquatic stage (a tadpole or larvae), and then metamorphoses - this group (mostly) has no tadpoles! Instead, the female has a pouch on her back where fertilized eggs are placed. Within that pouch the eggs develop and after some time the young froglets squeeze their way out as miniature versions of the adults.
In reality, however, this is just one of many reproductive techniques found in amphibians. The concept of a traditional amphibian is a bit flawed. There are species that follow the traditional dual life stage role but there are also species that carry their tadpoles to bromeliads and feed them unfertilized eggs, species that develop entirely within their eggs laid in the leaf litter, and even a species that gives birth to tadpoles after undergoing internal fertilization (almost all frogs use external fertilization) and numerous others. These reproductive adaptations allow frogs (salamanders and caecilians) to survive in places without large bodies of water or stable aquatic environments.
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