Platypodes is a lightweight mod that adds a Platypus as a standalone mob to Minecraft! I also have a resource pack that replaces Axolotls with Platypus Here

Features

Platypus

• Based on Minecraft's Axolotl
• Found in rivers
• 4 natural spawning, common variants
• 1 rare variant from breeding
• Can be picked up with a water bucket
• Can be bred with Yabbies

Bucket of Platypus

• Acquired by using a water bucket on a Platypus
• Easily transport Platypus
• Changing item texture based on held variant

Platypus Spawn Egg

• Spawn a Platypus

Yabby

• Acquired from breaking Seagrass, fisherman villagers and fisher huts
• Used to breed Platypus