Several of these - WIET, WROH, WTVF - were "placeholder" CPs issued to the SUNY regents to hold educational channels until organizations could be formed to operate them. There were a few others. I'll have to dig out the list. WTVF went away after WBUF-TV was donated for noncom use, becoming WNED. The WROH CP sat dormant for many years while RAETA (the local educational broadcasting organization) tried to get all or part of channel 13 in Rochester. RAETA was actually one of the nine parties in the interim Channel 13 licensee that put WOKR on the air in 1962; it subsequently sold that interest when it finally activated channel 21 as WXXI in 1966. Nobody ever came along to operate the Ithaca 14 allotment. I believe other "placeholder" CPs became WCNY, WMHT and WNYE-TV.
WCBF 15 was Rochester, not Buffalo; it was the replacement callsign for WARC-TV after WARC(AM) became WBBF in 1953. WARC-TV/WCBF was never built; nor was the other Rochester UHF CP, WRNY-TV 27. But therein lies an interesting story: WHEC-TV and WVET-TV, which were sharing time on channel 10 as a primary CBS/secondary ABC affiliate, asked the FCC circa 1957 if it would license channel 27 to them as well. The idea was that channel 10 would be the CBS affiliate, channel 27 the ABC affiliate, and WHEC-TV and WVET-TV would swap channels back and forth during the day. (The inspiration, evidently, was WBAP/WFAA in Dallas-Fort Worth, which were ABC on 570 and NBC on 820, with each operator having half the day on each frequency.)
The FCC instead pursued the channel shuffle that allowed a third VHF channel, 13, to come into the market in 1962.
WHCU-TV 20 and WJTN-TV 58 were among the many UHF CPs issued to radio stations and never built. (Or did WHCU-TV operate very briefly? I'm not certain. I know WKNY-TV 66 in Kingston operated briefly in the fifties.