This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 豤 is uncertain. It combines 豕 (pig) and 艮, but the original semantic and phonetic roles are unclear.
With no clear meaning, focus on the shape: a pig 豕 beside 艮. If you must assign a meaning, imagine a pig stubbornly biting or gnawing, based on the kun-reading か.む (to bite), but treat this as a mnemonic only.
For コン, imagine a pig biting a cone: cone -> コン, and the pig 豕 gnaws on it stubbornly.