Alexander Thom of Ohio (and Slaymaker of Pennsylvania) appear in the Turtle Township settlement list for 1856 (garbled list).

Nation and worldGrade A · 1 independent source

The evidence

“Slaymaker Pennsylvania.. Alexander Thom Ohio Turtle 1856 Turtle April, March, H. L.”
1879-history-of-rock-county/13-rock-county-ch07-town-histories.md, PDF p. 524
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources
The printed page (PDF p. 524). The passage could not be located on the scan automatically.