1st - Welcome Aboard! You didn't list your state (or country) in your profile. So, you might consider jumping over to Sub-Forum: Select Your Area.... and selecting location information (i.e., clubs, hunts, finds, legends, maps, etc.) directly related to your state (or country)...
2nd - I moved ya over to WHAT IS IT? for more exposure.
The vesicles would indicate something volcanic, or man-made slag. If you were hoping for meteorites, they aren't (because of the vesicles).
Details of where you found them, a judgement on density, whether they are attracted to a magnet (and, if so, how strongly), hardness, and a streak-test result might help narrow it down.
Look like slag or clinkers. And a goldfish cracker.
Are you posting random objects or having a suspicion of what you think they are?
Context matters. Where did you acquire them? Near the back fence of an old house?
In an old alley?
At the bottom of a fifteen foot deep crater?
My guess is they would shatter if smacked with a hammer. What does that mean?
Unless you are looking for evidence of former iron melting process or a coal stove.... Help me out here.
What do you think your specimens are related to ?