‘ And he offered the present to Eglon, king of Moab. Now Eglon was a very fat man.'
The present, or tribute, would be carried by servants who would bring it in so that it could be checked. The tribute would be in the form of goods and produce. The fatness of Eglon is mainly described to explain the size of the sword, but also possibly in mockery, or even to point out how well he had been living off Israel.