This video is called Xenopus laevis [African clawed frog], from tadpoles to frogs.
From the BBC:
Tadpoles could hold the key to developing effective skin cancer drugs according to researchers at the University of East Anglia.
The scientists have identified a compound which blocks the movement of the pigment cells that give the tadpoles their distinctive markings.
It is the uncontrolled movement of pigment cells that causes skin cancer in both humans and frogs.
Xenopus laevis frog whose pigments can be manipulated by the new compound
XENOPUS LAEVIS FACTS
Also known as South African Clawed Frog
Has same organs, molecules and physiology as man
Can produce eggs all year round
From 1930s to 1960s was used for human pregnancy testing by injecting woman’s urine sample into them and seeing if the frog laid eggs within 24 hours indicating that the woman was pregnant
Sexually distinct development of vocal pathways in African Clawed Frog: here.