Gren-O

Gren-O is a frog-type BioBuddy. He can combine with the Frog Sub to modify its submarine mode or to configure it into Animal Mode. Typically, he operates the cockpit of the Frog Sub on his own.

Biography
Gren-O typically circles Paris's bays riding the Frog Sub. When the Lab Rats came to Paris to thwart Marcus's plans at the Eiffel Tower, Gren-O came to assist, though he protested everytime the Lab Rats attempted to pilot for him.

When Douglas was about to upgrade the Viratron Zeta Upgrade, Danny Davenport contacted him to assist, & tasked him to be ready by the bay area. Though still in prototype stage, he assisted in bringing down the Viratron Upgrades attacking.

Trivia

 * He is the smallest BioBuddy, he is able to sit on Ursula Lettuce's head, the smallest of the core three BioBuddies.
 * He is the only one who is not partnered with a Lab Rat, as there is no Lab Rat wth a green Gear Beast Mode in the main universe. There are, however, two Green Hippo Rangers in the alternate universe.