Belandrid

Belandrids were an amphibious humanoid species native to the planet Belandros. They are characterized by their blue skin, yellow eyes with vertical lids, and webbed fingers and toes (seven digits on each hand and foot). They typically stood approximately just under one meter tall, and spoke in a gurgling voice.

The Federation made first contact with the Belandrids shortly before 2281. Upon the contact team's return to Earth, a single Belandrid named Obo accompanied them. Obo remained at Spackdock, where he befriended engineering Lieutenant Robert Harper, and also displayed an innate Belandrid ability for technical repair. 

Though it was initially believed Belandrids did not have the discipline or cultural grounding to become Starfleet officers, this was disproven by Lolo, a Belandrid who served with distinction from the 2360s into the 2380s.