Barry is an adorable Poison Dart Frog - however his touch can cause total paralysis. He is a transfer from the Hoboken Zoo, and he uses his poisonous touch to terrify other animals, and boss them around into doing whatever he wants. All he has to do is lift one finger as a threat. He is not the "hugging type" but he became nicer after Private shows him affection through a contactless hug.

He appears in The Big Squeeze, but has no speaking role. Ironically if he had got out, he could have stopped Savio cold in his tracks.

He had a small part in Byte-Sized, where he got his tongue stuck on the cotton candy machine, and was saved by the penguins.

He had a very small cameo in Thumb Drive and again he has no speaking role.

Barry will appear again in the episode Best Foes, where he is seen to infect all the penguins after they accidentally attack him.

Madagascar Wiki

Reference to his voice: https://youtu.be/_NdAX6amLdo