It is known only from the Manombo Special Reserve, where it inhabits open lowland forest with short trees, lianas, and thick layers of dead leaves.

Although it has not been assessed by the International Union for Conservation of Nature, the authors of the article in which it is described recommended that it be listed as critically endangered due to its extremely small and highly deforested range.

Mini mum was described in 2019 by the herpetologist Mark Scherz and colleagues on the basis of an adult specimen collected from the Manombo Special Reserve in Atsimo-Atsinanana, Madagascar in 2014.

The study that described the species placed the genus Mini as sister to Plethodontohyla (which contains the world's largest microhylid frog, P. inguinalis), despite the former being morphologically more similar to Stumpffia.

[1] Within its genus, it can be distinguished from both M. scule and M. ature by the absence of the maxillary and premaxillary teeth, as well as a more distinct border between the upperparts and underparts along the side.

It is also similar to some species in Stumpffia but can be distinguished from them by its poorly ossified carpals, curved clavicles, and a neopalatine (supporting the premaxilla medially) and divided vomer.

It is thought to inhabit open lowland forest around the reserve with short trees, lianas, and thick layers of dead leaves, at elevations of 0–100 m (0–328 ft).

A female specimen collected in late March contained four eggs, while the male holotype had several arthropods (thought to be oribatid mites) in its stomach.

[1] Although M. mum has not been assessed by the International Union for Conservation of Nature, the authors of the article in which it is described recommended that it be listed as critically endangered due to its extremely small and highly deforested range.