What does my friend’s dog want from me?

Hi!

My friend's dog is a corgi, about 5 years of age. I try to learn more about dog behaviour to understand what dog's want, but this dog truly baffles me.

If I come over (I do about weekly), he will immediately start barking up a storm jumping at me (which, normal, fine!). Once I take off my shoes, I'll bend down to try and pet him to give him the attention I'm assuming he wants, and he'll just start gnawing on my hands and continue barking/jump (in which case, I stop, although most dogs are satisfied by petting or will move away/leave I find if they don't want to be pet? He will continue jumping at my legs?). If I sit on a couch/chair he'll jump up and crawl onto my lap (okay, great) but then he'll look up and just start barking at me more. If I go to pet him, he'll gnaw at my hands. Does he want to be pet or near me or what?

I figure let's not reinforce the barking behaviour, so stop petting/paying attention to him altogether. He does not like this and will continue barking up a storm.

What does he want? If I throw a toy, he'll sometimes go and grab it, walk it somewhere else, drop it, and then immediately come back and bark/gnaw at me. A lot of times he just ignores the toy altogether. The biting isn't hard by any means, it's just slightly annoying, but the only way I can get him to stop barking is if I pet him/fight around him trying to bite me. Otherwise, he will bark into infinity (or like, at least the first half hour, he may stop temporarily until somebody makes any movement again). If he does chill out, he is a big snuggler/likes being pet indiscriminately, but you must not move for an extended period of time to have this happen (heaven forbid I get up to get a glass of water lol).

My friend will usually just ignore/yell at him to stop barking (he does not listen lol). Is this just a corgi thing that he is a little demon who just wants to bark in my face? Does he just want to try and bait me into petting him because he enjoys the taste of my flesh?

Obviously I don't want to make him uncomfortable, but I'm always looking at him like WHAT DO YOU WANT FROM ME?