Actually, there are no frogs in this picture as you see it. This is just a woman with a helmet which had a pair of huge goggles. If you really want to know why this is called frog monsters, you have to read the whole story, as this is my art for a sci-fi novel cover titled 'Mysteries on the Colony Ship' from the Colony Ship Eschaton series.
You could find the novel here:[link]
And this is the outline of the book:
Book 5 in the Colony Ship Eschaton series.
'Something mysterious is happening. The giant colony Ship Eschaton is in the midst of its generations long journey to another solar system. But in Habitat One: Coastal Plains, two strange bodies have been found. There are rumors of a lurking visitor. Is anyone safe?
The artificial intelligence systems still are not functioning as expected. Now more then ever, the AIs are needed. The people born on the ship, as well as the refugees from Dome 17 are struggling to survive, and to learn more about the huge colony ship and its various habitats. But what do these mysteries mean?
Jamie, Michael and their friends set out in an attempt to unravel these mysteries, but what they encounter is not what they expect. Who will make it back alive?'