I meant the other way around, my bad. The DMG style GameBoy carts could probably be played in the clone console this cart came with. From the appearance of another comment, it likely would have been a keyboard with cart slots big enough to accommodate genuine DMG style cartridges on it.
It kinda looks like a game king cartridge, from the inside bits (can’t find a pic of the whole thing), but that’s from the early 2000s. I went through a list of older handhelds and that’s the closest entry. But importantly, that probably isn’t it.
What you have is probably a regional knock-off sort of thing, or something that was never popular/prominent enough to be added to the wiki page.
This is the handheld list I went through. I stopped at the DS, as I assume yours is considerably older than that. Some of the old systems only have a handful of games for them, so it’s possible it’s something that just wasn’t made in large numbers, but my bet is on super-generic-knockoff-gamebay/gamboy/toyboy/gamekid handheld system (jokey knockoff names not real things afaik), which are not listed with the actual non-knockoff systems. (I wasn’t able to find much about vintage knockoff/copy systems)
Yes, I already knew that thanks to google image search. After that I went to https://uc.pory.app/ and checked all the items for GLK and the manufacturer. Right now I am at a dead end.