Erf by Garth Ennis

At the dawn of time, Erf and his three amphibious friends, Figwillop, KWAAAH, and the Booper, take their first nervous steps out of the ocean, the beginning of an adventure into the primordial world. As they explore the exciting new lands beyond the shore, they discover that the prehistoric jungle is home to the mighty and terrifying Colossux. What follows is an evolutionary fable of love and loyalty for readers of all ages!