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Chain Chomp (42, rev. 26)
By  Hiccup on 10-03-15, 04:11 pm
Category 'Enemies - Overground', known, fully documented
Incomplete because of the Defunct value (2).

USA version Crash Dump screen after going near the crashing Chain Chomp in 1-2:
http://i.imgur.com/nuSfkqF.png
Data files:
• /enemy/w_pile.nsbtx (chain chomp's log)
• /enemy/wanwan.nsbmd (chain chomp)
• /enemy/wanwan_chain.nsbmd (chain chomp's chain)
Sprite fields:
Spawn Chain Chomp: checkbox at nybble 11 with mask 1. Value 0 is unused. Value 2 CRASHES the game and is used in Unused Level 3, but is otherwise unused.
Chain Chomp (42, rev. 27)
By  Hiccup on 10-03-15, 09:36 pm
Category 'Enemies - Overground', known, fully documented
Incomplete because of the crashing values.
Data files:
• /enemy/w_pile.nsbtx (chain chomp's log)
• /enemy/wanwan.nsbmd (chain chomp)
• /enemy/wanwan_chain.nsbmd (chain chomp's chain)
Sprite fields:
Number of Chomps: value at nybble 11. 0 is unused. 2 CRASHES the game and is used in Unused Level 3, but is otherwise unused. Values above 2 also crash and are completly unused.