@Will I guess you are thinking that because it is a "smart" device, and has an operating system and "apps" layered on top of that, it should behave a bit like a PC (or even a server)? That is not the case I am afraid (certainly not outside of manufacturing, and internal development tools, as far as I know). Exposing the OS and the file structure to outside influence, tools etc could do untold damage, break any inbuilt security layers, and might even make it unbootable. Therefore the underlying WebOS is not available for external Browser or Terminal Session login in the normal way. Even if you try to compare it with a modern Router, that you CAN log into, the UI there will always be very restrictive, and only a limited subset of the command set and file structure is available (even from SSH to do CLI stuff) for similar reasons.
There IS a developer mode for authorised developers, but that is very controlled, and access is via a developer app, using an accredited account to log in on a development PC or laptop. The API's involved would (AFAIK) only communicate in a specific way, and do not expose any internal file structures, it is just there for deploying and testing apps, and session time is limited to 50 hours.
The best you can do if you want to de-clutter your TV and remove the unwanted apps, it to see if your model supports the app deletion in the EDIT mode. Some apps might be "system" ones that might be "pinned" or bundled in, and might not have a remove option. Have a read of this Toms Guide below:
https://www.tomsguide.com/us/lg-tv-settings-guide,review-5624-3.html