No. The only metal we can safely digest is pure gold leaf.
There are only a few metals that can be safely ingested because most have toxic effects. The process of digestion is the breaking down of materials into absorbable components. There are a number of metals that can be digested. The hydrochloric acid in the stomach can digest iron, aluminum, copper, zinc, all of the group 1 and 2 metals and salts of silver, lead and mercury. Digesting does not necessarily mean that the quantity of metal will be entirely digested.
Say your hypothetical metal corncob (I hope it is hypothetical) is made of brass. Brass is an alloy of copper and zinc. It will be corroded by the stomach acid and produce copper and zinc chloride. Neither of those salts is particularly good for you and may irritate the intestines but will probably not be absorbed in quantities large enough to poison you. If the corncob was coated with lacquer, as most ornamental brass pieces are, the stomach acid cannot come in contact with the metal so it will not be digested.
The preceding answer claims that gold can be digested. On the contrary, it will not be affected by any digestive process in the human body. It will pass harmlessly through the digestive tract without being affected. Some alloys, such as stainless steel will be similarly unaffected.
To get a better answer to this question, find out what sort of metal your corncob is made from and ask about digesting that metal.