This isn't really a round barrow, but it's kind of like a round barrow. A burial and a glass bead were excavated from it. The EH scheduled monument document says that it's really a natural glacial mound used as a prehistoric burial site. This seems to match with the description below.
Few travellers who have passed along the north turnpike from this place can have failed to observe, in two fields on the right hand of the road, immediately before approaching North Charlton, two very conspicuous rows of ancient barrows. Very probably, indeed, many who have observed them may have considered them as natural inequalities of the ground only, but to the classical antiquary they could not be mistaken the moment they were in his view. [..] There are a dozen or more hillocks in each row.
While some workmen were digging for stone for the road, they found a stone-lined grave, in which there was a skeleton with 'a brass spear, rivetted on to a bone handle' - but maybe that sounds more recent than prehistoric? or maybe not. From 'The Local Antiquary' in the Newcastle Magazine, by JC of Alnwick, February 1824.