I also like amphibious reptile idea

Hey guys, seriosly I didnt have time to make the amphibious reptile but I amde this for my Birthday.
A Platypus Whale!

It is great and killer whales seem friendly but I would not want to be in the water with one ever lol but I like the comparison. Good description of him and happy b-day and Doom day duo

Hope to see more. Possibly the reptile/amphibian combo I am quite interested to see what that comes out to be.

Thank you guys! I really appreciate this community and you! Also here is the aquatic reptile. I imagined this guy years ago as a enemy in Turok.

Basically Turok Leaper and Freddy Krueger had a baby.
Looks like a dinosaur, but its not a dinosaur, its a far cousin of dinosaur and much primitive. Mergar (Aquainterfector mandocaris) is a medium size hunter that lives in the swamps, estuaries and mangroves of the interior sea. The large claws and short teeth allows to open and crush the crustaceans of his habitat, but they would use it to defend himself or capture fishes or other preys. Another hunt attack is similar to the long related cousin the eusuchian crocodiles. Aquabumser, stalks under water like a shark and emerge like a vicious crocodile with sharp claws. Then he drowns the victim. The natives call him as the Dark Drowner. His natural predators are Leviathans, big amphibian dinosaurs, crocodiles and probably the cryptid Typhoon.
This animal was under the radar of the Challenger Group to investigate this animal, due 4 animals were found dead with large burned wounds with large amount of uranium, sulfur and radioactive materials.