I have seen many Thai political cartoons that feature a small green snake saying "mamba" if you know, please tell what that is about.

Mambas are fast-moving, terrestrial, venomous snakes of the genus Dendroaspis (literally "tree asp") in the family Elapidae. There are four extant species. Native to Africa, they are feared throughout their ranges, especially the black mamba. In Africa, there are many legends and stories describing these snakes.^[2]

This goes back to the floods of 2011.

http://www.thaivisa.com/forum/topic/509762-danger-from-the-flood-emerges-as-deadly-green-mambas-escape/

Mambas are fast-moving, terrestrial, venomous snakes of the genus Dendroaspis (literally "tree asp") in the family Elapidae. There are four extant species. Native to Africa, they are feared throughout their ranges, especially the black mamba. In Africa, there are many legends and stories describing these snakes.^[2]

I actually knew this... but I am interested to know why they are in Thai political cartoons. I know that some green mambas escaped from a zoo or snake show a couple years ago maybe some connection there?

The cartoons are by Stephff (real name Stéphane Peray). His current cartoons for The Nation incorporate a number of motifs from the flood period, not only the green mamba, but the Prime Minister's Burberry boots and the monitor lizard with a coil of poo on its head.