Whip and Lash appear in the first quest of the Return to Dragon Island Expansion Pack. They pulled Bucket and Mulch out of the toxic fog after their riders fall ill.
They were in a separate quest pulling Mulch's ship to shore, while Heather was riding them.
Whip and Lash are green and blue in color with darker blue barbs on its neck and back. Although it does appear that Whip has a green face where as Lash has a blue face.