Reptiles have scaly skin, and those that lay eggs do so on land. (Some reptiles give live birth.)
What kind of living organisms are the following: has scales and lays eggs on land
It is a spelling error. It should be "Reptile". A reptile is a kind of animal that lives on land, has scales, and lays eggs.
Turtle
a reptile
a snake
Owls do have scales on their feet.
The hippo is the 2nd heaviest land animal. It tips the scales at 8,000lbs.
Alligator/Crocodile
Well, assuming you mean "What is a land animal with scales", I can tell you that some land animals with scales include lizards, snakes, pangolins, anteaters and lungfish, which spend part of their time on land. Scaly mammals such as pangolins and anteaters actually have modified, flattened hairs for scales.
Reptiles or fish, and rarely other animals
The answer to this is not based on where the animal lives but on the type of animal. Animals that lay eggs have fewer extraembryonic membranes than placental mammals...there are mammals in the ocean as well as on land.
The Komodo dragon and rhino iguana are examples of land animals with scales at the Singapore Zoo. They also have many species of snake, including the rattlesnake, cobra and reticulated python.