Simple past tense and past participle of frock.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "frocked" in a sentence
"The message announced tersely that Lieutenant Commander Robert A. Toland, III, USNR, had been "frocked" as a Commander, USNR, which gave him the right to wear the three gold stripes of a commander, but not to collect a commander's pay just yet."
"No more compulsory vows, no "frocked" younger sons "to make an elder," no girls immured from infancy, kept in the convent throughout their youth, led on, urged, and then driven into a corner and forced into the final engagement on becoming of age; no more aristocratic institutions, no"
"The broadcast invariably communicated something about their great society, envy of the world, then gave a rambling weather report, and ended with frocked maidens dancing a polka."