What you have is a flash cart, it has nothing to do with the SpongeBob cartoon/franchise (though it may be illegally using the character in its branding).

What the flash cart does is, it presents itself as a 3DS game to the 3DS handheld, but it lets you load code (ROMs) that the game can run. The 3DS can natively run DS, DSi, GBA, GBC, and GB games.

You can find some Super NES games that were ported to those handhelds, like for example A Link to the Past was ported to GBA.

If you jailbreak your 3DS, you can use RetroArch to run Super NES games. Note that the "New" 3DS can run Super NES games ported directly to 3DS; however, Nintendo has locked these files out of running on the OG and XL 3DS models (if it doesn't have the C-button/joystick). There are probably still ways to get those games running.

Also, if you jailbreak your 3DS, you won't need the flashcart anymore, you can just copy the ROMs right to the 3DS.

You can run RetroArch on any fairly modern iPhone or Android phone, too, so running Super NES games on a handheld is most likely not outside your reach, even if you didn't have a 3DS.