Mystery amphibian

[VarJack]

A mysterious amphibian, 10-15 cm in length, from a mangrove forest in Malaysian Borneo. There were lots of them and they were using their tails to propel themselves forward in small jumps.

Any idea about the species?

[JackBean]

that's not amphibian, it's a fish
Some of the Goby
http://www.biolib.cz/en/taxon/id16063/
either this or this

[VarJack]

Thanks, it must have been a mudskipper. Never saw one before.