The Young Yellow Wollywog are hopping around and they try to crush the Pikmin. They are also able to swim like its adult form. They can be killed with a single Pikmin throw.
Hey! Pikmin log
"This would seem to be the intermediate stage between a Wogpole and a Yellow Wollywog. I asked my daughter if she wants to be a pilot like me when she grows up, and she said, 'No! I want to be a boss, like Mommy!' Which seems fair."