early 13c., talken, probably a diminutive or frequentative form related to Middle English tale "story," ultimately from the same source as tale (cf. hark from hear, stalk from steal) and replacing that word as a verb. East Frisian has talken "to talk, chatter, whisper." Related: Talked; talking.
To talk shop is from 1854. To talk turkey is from 1824, supposedly from an elaborate joke about a swindled Indian. To talk back "answer impudently or rudely" is from 1869. Phrase talking head is by 1966 in the jargon of television production, "an in-tight closeup of a human head talking on television." In reference to a person who habitually appears on television in talking-head shots (usually a news anchor), by 1970. The phrase is used earlier, in reference to the well-known magic trick (e.g. Senior Wences talking head-in-the-box trick on the "Ed Sullivan Show"), and to actual talking heads in mythology around the world (e.g. Orpheus, Bran).
late 15c., "speech, discourse, conversation," from talk (v.). Meaning "informal lecture or address" is from 1859. Talk of the town first recorded 1620s. Talk show first recorded 1965; talk radio is from 1985.