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Have you tried the census on line the following links will take you to the 1901 and 1911 pages for Tolans in the townland of Tievachoky there seems to be only one family by that name in the townland
The following is an extract from The Donegal Awakening Donegal and the war of independence
The houses of Hugh Boyle, Castlegrey, James Cassidy, Drimfin and Denis Tolan, Keelogs, Inver were raided on the same day but nothing was found.127 Similar raids were carried out in the west of the county; John O'Gorman had been ...
The Griffith Valuation has a Hugh Tolan on just over 58 acres of land and house which he was paying £5/15s to the Marquis of Conyngham http://griffiths.askaboutireland.ie/gv4/gv_print.php?id=066013
Hope this is of help I would need more details as there is not much to go on