Games like Mutant Frog
Games like Mutant Frog include SANABI, Hollow Knight, Katana ZERO, Celeste, and Ori and the Will of the Wisps. We matched them by the tags players give Mutant Frog on Steam (Action, Casual, Adventure, Platformer, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Action · Adventure · 2D Platformer

Hollow Knight
Shared: Platformer · 2D · Indie

Katana ZERO
Shared: Action · Platformer · 2D Platformer

Celeste
Shared: Platformer · 2D Platformer · Indie

Ori and the Will of the Wisps
Shared: Platformer · Action · Adventure

Dust: An Elysian Tail
Shared: Action · Platformer · Adventure

Sonic Superstars
Shared: Action · Platformer · Adventure

BEEP
Shared: Adventure · Platformer · Action

Super Fancy Pants Adventure
Shared: Action · Adventure · Casual

Sonic Origins
Shared: Action · Adventure · 2D Platformer

Hollow Knight: Silksong
Shared: Indie · 2D · Platformer

Skul: The Hero Slayer
Shared: Action · Indie · 2D

Planet of Lana
Shared: Action · 2D Platformer · Platformer

Nine Sols
Shared: Action · Platformer · 2D

Minimalism
Shared: Casual · Action · Platformer

Pikuniku
Shared: Casual · Adventure · Indie

F.I.S.T.: Forged In Shadow Torch
Shared: Action · Platformer · Adventure

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Mark of the Ninja
Shared: Platformer · Action · 2D

Tomb Raider Game of the Year
Shared: Action · Adventure · Story Rich

Rogue Legacy 2
Shared: Action · Platformer · Adventure

Nihilumbra
Shared: Adventure · Platformer · Casual

Owlboy
Shared: Adventure · Platformer · Indie

Deadlight
Shared: Action · Platformer · Adventure