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Hey!

That's a good question, I'd like to know that too.

I'm not sure if there is a special vocabulary, maybe not? They just use words like 肥満、食欲、皮下脂肪 and 豚 of course. These seem like fairly neutral words to me.

If you take a look at Twitter, there is definitely a scene here, but what I mostly see is people drawing artwork, I found only one Japanese guy who is gaining.

But there are fat hosts too, like 美豚 (Biton), so it has to be a thing. If you look at his profile he's also shown eating on most of the photos, which makes me pretty sure that this is a feederism thing. Though it's questionable if you want to spend your whole salary in a host club just to TALK to a fat guy.

キャラグッツof fat characters also exists. I just bought a post card a few days ago ^^

I am Japanese so I may give some tips for you.
You should know these words.it’s included slangs.
“肥育” (hi iku) : feeding something.
“自己肥育”(zi ko hi iku) : feeding myself.
“強制肥育” ( kyo sei hi iku) : force feeding.
“肥満”( hi man ): obesity.
“肥満化”( hi man ka) : Get fat. This word is not popular. It is used only in community.
“太る”(futo ru) “太った”( futo tta) : get / got some weight. It is popular phrase.
“デブ” (de bu) : fatty. This is a dirty word. Don’t use it without trusted gainer.
“デブ専” (de bu sen): Someone who loves only fatty man/woman.
“ぽっちゃり”(potchari) ぽちゃ(pocha) : plump.
“みけぽ”(mi ke po) : more than 100kg(220lbs) size.

“肉塊”( niku kai): It means meat block. But in the community, it means immobile obese ( Almost use on fantasy fiction).

As far as I know, Japanese feeder / gainer community like fantasy feeder is not exist. Almost Japanese gainer / feeder use Twitter. So search Twitter and use mentioned words.

Let me know If you need another information.

Thanks a lot! ありがとうございました！❤️

Here in Osaka, both men and women use "pocchari" to describe being chubby, without a sense of judgement.

But since my girl's kept gaining weight and getting confident about it, she's graduated from describing herself as "pocchari" to "debu!"

this is helpful

Don’t worry about it!
I know that the people who know about japanese community is not majority in fantasy feeder. No wonder you think like that.