There is no such thing as "infibians." It's likely a misspelling or a word made up for a fictional purpose.

Here's what you might be thinking of:

* Amphibians: These are a class of vertebrates that include frogs, toads, salamanders, and newts. They are known for their ability to live both in water and on land.

* Fibians: This word doesn't exist in any recognized dictionaries. It's possible it's a made-up word used in a specific context or story.

Could you please provide more context or clarify what you mean by "infibians"? This will help me understand your question better and provide a more helpful answer.