Fausset's Bible Dictionary
("good".) Where Jephthah was expelled by his stepbrothers; here he gathered to him a band of freebooters; from Tob the elders of Gilead brought him to oppose Ammon. Toward the desert E. of Gilead. Ish-tob, i.e. the men of Tob, supported the Ammonites against David (2 Samuel 10:6; 2 Samuel 10:8). Ptolemy (Geogr. v. 19) mentions a Thauba S.W. of Zobah, probably N.E. of Ammon. There is a Tell Dobbe or Dibbe, a ruined site S. of the Lejah.
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Fausset, Andrew R. Entry for 'Tob'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/t/tob.html. 1949.