Homebrew Crocodilian Species Details

Ability Score Increases: +2 Strength, +1 Constitution
Age: 120-200 years
Alignment: Most crocodilians tend to lean toward neutral alignments, focusing on survival and the strength, though individuals can be of any alignment.
Size: Crocodilians are medium, typically standing between 7 and 8 feet tall and weighing around 220 pounds or more
Speed: Your base walking speed is 30 feet. You also have a swimming speed of 30 feet.
Languages: You can speak, read, and write Common and Undercommon.

Eyes: Crocodilians have reptilian eyes with slit pupils. Their eye colors vary, commonly appearing in hues of yellow, green, or amber. Their keen vision allows them to see well in both bright light and darkness, an essential trait for their swampy habitats.
Mouth and Teeth: They have powerful jaws filled with sharp, conical teeth designed for gripping and tearing. Their mouths are broad and can open wide, displaying their formidable bite when threatened or in battle.
Tail: Crocodilians possess a long, muscular tail that aids in balance and swimming. The tail is covered in the same tough scales as the rest of their body and can be used as a powerful weapon if needed.

Natural Armor: You have tough, scaly skin. When you aren't wearing armor, your AC is 13 + your Constitution modifier. You can use your natural armor to determine your AC if the armor you wear would leave you with a lower AC. A shield's benefits apply as normal while you use your natural armor.
Bite: Your fanged maw is a natural weapon, which you can use to make unarmed strikes. If you hit with it, you deal piercing damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.
Hold Breath: You can hold your breath for up to 30 minutes at a time.
Aquatic Adaptation: You have advantage on Strength (Athletics) checks made to swim.
Frenzy Assault: When you reduce a creature to 0 hit points with a critical hit, you can make two melee weapon attacks as a bonus action. You can use this feature once per long rest.
Bloodthirst: You have advantage on attack rolls against creatures that have less than half their hit points remaining.
Relentless Fury: When your hit points are below half your hit point maximum, you have advantage on Strength checks and Strength saving throws. Additionally, once per turn, you deal an extra 1d4 damage with melee weapon attacks.
Hunter’s Instinct: You have proficiency in the Perception skills.

Crocodilian Traits

Lizardfolk, low intelligence, high strength + constitution

Due to their harsh living conditions and natural benefits, they are stronger ambush predators and have thick scales that act as armor.