Ranfo

From TARDIS Index File, the free Doctor Who reference.

The Ranfo were the the original inhabitants of the planet Harenkast. They looked a bit like huge frogs, but with tails and purple dots. At some point a group of Humans arived at their planet, and started building cities. The Ranko kept to the countrycide and both groups lived in harmony for a time.

However, when Manver Autos started to brainwash the humans into buying cars that destroyed the countrycide, tensions arose. This was only resolved once the doctor found the source of the brainwashing and disabled it. (DWBIT: Exhausting Evil)