This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
豩 is composed of two 豕 (pig) components side by side. The exact historical development and original meaning are uncertain.
Two pig components 豕 stand side by side. Without a clear meaning, picture a rare character representing a herd of pigs, but treat its meaning as uncertain.
For ヒン, imagine two pigs making a high-pitched hin sound: hin -> ヒン, like the squeal of a pig.