UNSOLVED MYSTERY

Here I am on the phone with my mom last Saturday, providing some visual analysis of this weird pod we found. She thought it might be carob, so I emailed her a photo for confirmation— just in case. Her response:
Hi Hon,
Not sure what it is. What I thought it might be rom [sic] your description wold [sic] have been much skinnier in proportion. Cool though but don’t eat it!
Love,
MOM

Molly was even less helpful.