10 Dangerous Monsters from Monster Manual 2 (1983) that you may never have heard of

Here are 10 dangerous monsters found in the 1983 version of Monster Manual 2.  (not considering dragons, giants, undead, outer planar creatures)

Choke Creeper: (high hp, strangulation attack)
Death Watch Beetle: (high hp, save or die attack)
Executioner's Hood: (hard to hit, strangulation attack)
Froghemoth: (high hp, swallow attack)
Hangman Tree: (very high hp often over 500, swallow attack)
Stegocentipede: (high hp, much better AC, poison)
Tunnel Worm: (destroy armor, high hp, high damage)
Wolf-in-sheep's clothing: (high hp, hard-to-kill)
Zorbo: (armor absorbing cave bear)