Burks, Disease, or Firewood Knots?

These growths were found on a huge dead pecan log I blocked up for firewood.
What are these growths?
I've heard they burn crazy hot?
Lost as a goose in high wind on this...

 

some cankers are a response to a fungus or a bacteria that certain trees are susceptible to
there appears to be several canker causes on pecans, whichever one is common in your area is likely the cause of those.

 

I never thought about burning them. Give 'em a try but I'll bet they're pretty damp.

 

Those are mushrooms. I wouldn't recommend burning them. Not burls or cankers.

 

Hmm...hard as brick or as my Grand-pappy use to say, "harder than the times of 1929!"
Must be fairly tasty to the critters because a gang of chipmunks are stating to reduce them in size...