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The Mutant Frogs[merch 1] are common Earth frogs, which were mutated by Dr. Animo's DNA Transmodulator.
Appearance
A mutant frog is a large, frog-like creature with moss green skin and a light green neck. It has two small horns on its forehead and two bone horns coming out of the sides of its head. It has four red eyes and orange lumps. It has an olive, spiky tongue.
In Ultimate Alien, mutant frogs had yellow eyes and lacks of the horns on their forehead. They were a darker shade of green, and the same color as the rest of it. They had a pink tongue.
In Omniverse, the mutant frogs' eyes are red again and their tongues were dark pink. Their skin is now a much brighter shade of green, and they have the smaller horns again, albeit slightly longer.
In Ben 10: Destroy All Aliens, it is gigantic and has a sandy color. Its webs are also bigger.
History
Ben 10
It was the first mutated animal via Dr. Animo experiment with the performance of his Trans-modulator.
With this frog, Dr. Animo attacks a supermarket where he mutates a bird and a hamster. He leaves with his frog and uses the bird for transport. At the end of the episode all of the mutant animals were returned to normal.
In Dr. Animo and the Mutant Ray, he appears at the beginning of the episode next to Dr. Animo.
In Ben 10: Destroy All Aliens, it appeared at the very end to show what a normal day for Ben is like.
5 years prior to Omniverse
A frog made a cameo appearance in It Was Them in one of Ben's flashbacks when Dr. Animo had been defeated.
Ultimate Alien
The frogs return in It's Not Easy Being Gwen, where they now had yellow eyes and Dr. Animo controlled them with a band on each's head. Animo intended to use another telescopic mutant ray to create a larger army of mutant frogs but he was defeated by Ben, Gwen and Kevin.
Omniverse
One appeared again in Animo Crackers, where Dr. Animo riding on it to fighting off the SECT. It grabbed onto a SECT's van and falls back down. According to future Dr. Animo, the A.R.C. Project didn't make it due to Dr. Animo not controlling the frog.

In The End of an Era, future Dr. Animo throws two vials to Ben 10,000 and Kai to keep them busy while he travels back in time. Two tadpoles break out of the vials and grow into Mutant Frogs. They were beaten by Kai Green using the Excalibur.
Powers and Abilities
A mutant frog is capable of great leaps, and being larger, can jump greater distances.
A mutant frog's tongue is broader in scope and is more sticky and adherent.
When Big Chill froze a mutant frog's feet, Dr. Animo actively encouraged it through a device that made the mutant frog create a warm aura around that melted the ice.
Weaknesses
One apparent weakness is that if its legs are frozen, the mutant frog won't be able to move unless it melts the ice.
A mutant frog can be repelled by a huge cloud of sulfur dioxide.[1]
Appearances
Ben 10
Season 1
- Washington B.C. (first appearance)
Season 2
Season 4
Ultimate Alien
Season 3
- It's Not Easy Being Gwen (first reappearance)
Omniverse
Season 1
- It Was Them (first reappearance; flashback; cameo)
Season 5
Season 8
- The End of an Era (future)
Trivia
- The mutant frog is Dr. Animo's first and most used mutant animal.
- The mutant frog occasionally wears a mind-controlling headband similar to the one Animo used on the Yeti in Escape From Aggregor.