Games like Frost Loop
Games like Frost Loop include Frostpunk, Against the Storm, Transport Fever 2, Manor Lords, and Dorfromantik. We matched them by the tags players give Frost Loop on Steam (City Builder, Strategy, Trains, Turn-Based Strategy, and Resource Management): closest matches first, and among equally close ones the better-known games.

Frostpunk
Shared: City Builder · Strategy · Resource Management

Against the Storm
Shared: Strategy · City Builder · Resource Management

Transport Fever 2
Shared: Strategy · City Builder · Trains

Manor Lords
Shared: City Builder · Strategy · Resource Management

Dorfromantik
Shared: City Builder · Turn-Based Strategy · Strategy

Frostpunk 2
Shared: City Builder · Strategy · Resource Management

Sid Meier’s Civilization® VI
Shared: Strategy · Turn-Based Strategy · City Builder

Factorio
Shared: Resource Management · Strategy · Base Building

Pioneers of Pagonia
Shared: Strategy · Resource Management · City Builder

Age of Empires II (Retired)
Shared: Strategy · City Builder · Resource Management

STAR WARS Zero Company™
Shared: Turn-Based Strategy · Strategy · Turn-Based Tactics

Into the Breach
Shared: Strategy · Turn-Based Strategy · Roguelite

Cities: Skylines
Shared: City Builder · Strategy · Resource Management

Kingdoms and Castles
Shared: City Builder · Resource Management · Strategy

Nordhold
Shared: Strategy · Turn-Based Strategy · Roguelite

Mewgenics
Shared: Roguelite · Turn-Based Strategy · Turn-Based Tactics

IXION
Shared: City Builder · Strategy · Resource Management

XCOM: Enemy Unknown
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

Age of Empires III: Definitive Edition
Shared: Strategy · City Builder · Base Building

Farthest Frontier
Shared: City Builder · Strategy · Resource Management

Prison Architect
Shared: Strategy · City Builder · Base Building

Terra Nil
Shared: Strategy · City Builder · Turn-Based Strategy

The Last Spell
Shared: Strategy · Turn-Based Strategy · Turn-Based Tactics

Workers & Resources: Soviet Republic
Shared: City Builder · Strategy · Base Building