Just wrote this: (from about Chapter 3)
The frog climbed into the boat, tipping it slightly towards the side, and clambered over the prow before squatting on the plastic seat between Morgan and Pam, one of the engineers who had been maintaining the spacecraft. About 6 foot long, its skin was a dark khaki colour, flecked with brown and blue. As he watched, Sam realised it was wearing clothes; a pair of very thin brown shorts, a thin, translucent vest and a pair of dark gloves reaching to its elbows.
'We know why you've come, so, spare the NASA shpiel about discovery and curiosity,' it said in a low, gravelly tone, putting one bulbous hand on the steering wheel of the boat. Captain Morgan turned pale and backed away as splashes of water from the frog's arm fell onto him.
Something else moved in the water. Another large frog, slightly smaller but with somewhat rougher, more wrinkled skin, barked something in distress and quickly put its head below the surface.