toad, mantis, (ghost kanji), (kokuji)
蟐 is a rare kokuji (Japan-made kanji) with no clear standalone meaning. It is associated with toad or mantis in some ghost character contexts, but its meaning is uncertain.
蟐 is a kokuji composed of 虫 (insect) and 常 (phonetic and possibly semantic). The exact historical development is uncertain, and it may have been created for a specific local or literary use.
The insect radical 虫 beside 常 suggests a creature associated with constancy or commonness, but the meaning is unclear. Treat it as a mysterious bug-like entity.
For ジョウ, imagine a constant (常) insect (虫) named Joe: Joe -> ジョウ, and Joe the bug is always there.