upper pic may or may not be a burl. You would have to cut it off to be sure its not a growth over a cut/broken limb. Still can have some good figure, but may not be really burl.
I've seen the small growth on the bottom turn out to be quilting when cut. So again, the only way to know for sure is to cut it open (which isn't allowed here).
The bulb at the bottom......... It's not on the root, so not a root burl which usually forms as the roots are confined by stone, or damaged in some way which really isn't a burl again although some of the best looking graining out there. Could be a regular burl, could be something else.......