(Marvel Mystery Comics 019, 1941)
I think this giant man has the Limbos MO covered: cause earthquakes via lava manipulation, then attack.
The real great thing about the Limbos, however, is the lower body. Give me this style of lizard-man any day. The poisoned bit is icing on the cake, really.
(Marvel Mystery Comics v1 010, 1940)
If there’s one thing you can say about just about any given super-hero universe it’s that any given cave, canyon or unguarded parking lot will have its own little group of creeps who lurk in it and are just spoiling for a chance to get up to mischief.
Our inaugural creeps are the Ghouls!
Hailing from volcanic caverns beneath the Blue Ridge Mountains, Ghouls just love to gather up hot ladies for volcanic sacrifice. They love big fur underwear and big rag shoes and hate when a super-hero like the Angel shows up to foil their religious observances. Good job, Ghouls!
There are also what seem to be giant ghouls in the same cave system. Not nearly as interesting, but still creeps.