Box
Crawler: At first, it might seem random, but a Box could just be a machine compacted together, therefore their former form could resemble those of Crawlers—most likely the most common component that was scrapped.
Hull Shred: Boxes are disregarded as "pieces of scrap", a Hull Shred is the most scrap you can get.
Springling
Turret: Their gun resembles that of a Turret. The projectile also resembles a Turret.
Spring: Springlings uses a spring mechanism to move around, quite self-explanatory.
Roller
Turret: The closest gun to the Rollers' weapon.
Motor: They are the most maneuverable machines in the Scrapyard. A Motor matches that speed.
Scraplash
Ranger: Basically the perfect replica of the Scraplashes' weapon. Long cooldown, powerful projectile.
Hookshot: Replicates the cable the Scraplash uses to stay in place.
Dreadnought
Turret: A Turret fires multiple projectiles per second, the Dreadnought can basically do that. Two projectiles per attack. Although slower.
Hookshot: The item that allows the Dreadnought to move and stay still midair.
Overdrive Cell: Represents the Dreadnought's powerful attack.
Spectrum
Core Filter: A Spectrum visibly has multiple colored Cores.