Swamp Thing, based on the DC Comics character, is a Game Boy action game released in the USA and Europe. The title likely features the titular character battling enemies in various levels and environments consistent with the Swamp Thing comic book storylines. Gameplay probably involves action platforming and combat elements, with Swamp Thing using his powers to traverse the swamp and confront antagonists.  More research is needed to uncover the developer and exact release dates of the title.

Swamp Thing (USA, Europe)

Super Super Mario Land