Doges

Doge's are the most common entity you'll encounter in The Dogelands. They can be traded with ores (Iron, DogTanium, Gold, etc) for items.

They have multiple variants depending on the circumstances.

andrechappie is a boss that can be summoned using commands or the tablet. his attacks and health vary on the worlds difficulty.

More on him in Bosses 

The Engineer serves literally zero purpose. It can be summoned with the tablet along with a poorly made turret and teleporter.

The Teleporter spawns entities and the Turret shoots hostiles. The engineer does nothing.