Ranfo

From TARDIS Index File, the free Doctor Who reference.

The Ranfo were the original inhabitants of the planet Harankast. They resembled huge frogs with tails and purple dots. At some point a group of Humans arived on their planet and started building cities. The Ranko kept to the countryside and both groups lived in harmony for a time.

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