If you look in a tiger's stomach you'll find a bunch of skin. It's really gross but what else did you think you'd find? Everyone knows tigers can't digest the skin of the things it eats.
The only person who would try to take skin from a tiger's stomach is a fool (ふ). You'll probably get your head bitten off looking for skin that way.
Currently there are no similar looking kanji which exist in the WaniKani learning system