Text across columns

In a word, no.

You can use a separate text frame for a heading and you could apply text
wrap to this to force into place over the three column frame. But if you
can't do this with a single text frame for multiple consecutive stories,
because your copy will run to the bottom of the frame and back to the top
for each column.

Your best option would be to make a table one cell wide, and paste a
three-column text frame into every other row.

k