Games like Frosthaven
Games like Frosthaven include Gloomhaven, King Arthur: Knight's Tale, Wartales, Jagged Alliance 3, and ELDEN RING. We matched them by the tags players give Frosthaven on Steam (Tactical RPG, Turn-Based Tactics, Board Game, Turn-Based Combat, and Dark Fantasy): closest matches first, and among equally close ones the better-known games.

Gloomhaven
Shared: Tactical RPG · Turn-Based Combat · Dark Fantasy

King Arthur: Knight's Tale
Shared: Tactical RPG · Turn-Based Tactics · Dark Fantasy

Wartales
Shared: Co-op · Turn-Based Combat · Tactical RPG

Jagged Alliance 3
Shared: Turn-Based Tactics · Tactical RPG · Turn-Based Combat

ELDEN RING
Shared: Dark Fantasy · RPG · Co-op

Baldur's Gate 3
Shared: Turn-Based Combat · RPG · Co-op

Bloons TD 6
Shared: Co-op · Singleplayer · Multiplayer

The Last Spell
Shared: Turn-Based Tactics · Tactical RPG · Turn-Based Combat

Warhammer: Vermintide 2
Shared: Co-op · Dark Fantasy · Online Co-Op

Mordheim: City of the Damned
Shared: Turn-Based Tactics · Dark Fantasy · Turn-Based Combat

XCOM 2
Shared: Turn-Based Combat · Turn-Based Tactics · Singleplayer

Demeo
Shared: Turn-Based Tactics · Turn-Based Combat · Tactical RPG

Stolen Realm
Shared: Turn-Based Tactics · Turn-Based Combat · Tactical RPG

For The King
Shared: Co-op · Online Co-Op · RPG

Temtem
Shared: Co-op · Turn-Based Combat · Multiplayer

Warhammer 40,000: Rogue Trader
Shared: Tactical RPG · Co-op · Turn-Based Combat

For The King II
Shared: Board Game · Co-op · RPG

Slay the Spire 2
Shared: Co-op · Turn-Based Combat · Multiplayer

Fell Seal: Arbiter's Mark
Shared: Turn-Based Tactics · Tactical RPG · Turn-Based Combat

King's Bounty II
Shared: Tactical RPG · RPG · Turn-Based Combat

ELDEN RING NIGHTREIGN
Shared: Co-op · Online Co-Op · Multiplayer

XCOM®: Chimera Squad
Shared: Turn-Based Tactics · Singleplayer · Turn-Based Combat

Limbus Company
Shared: Turn-Based Combat · Turn-Based Tactics · Singleplayer

Blood Bowl 2: Legendary Edition (Classic)
Shared: Board Game · Multiplayer · Singleplayer