For me Beatles For Sale was the first country/ folk rock hybrid.
Found this in a review of The Four Seasons Feburary 1964
album Born to Wander:
"typical mid-1960s Four Seasons album with a folkier feel to the production, and a few genuine folk tunes amidst a program largely comprised of material penned or co-penned by the Seasons' Bob Gaudio. The harmonies are nice and the presentation gutsier than, say, the Kingston Trio. But it's still much more of a polite folk-pop album -- the kind you could find everywhere in 1963
-- than a folk-rock one."
A definition of folk-pop (again Allmusic):
"Folk-Pop falls into two categories. Either it is folk songs with large, sweeping pop arrangements, or pop songs with intimate, acoustic-based folk arrangements. Folk-pop began to evolve in the early '60s, but it came into full force after folk-rock became a sensation in the mid-'60s. Folk-pop doesn't have ringing guitars and rougher edges of folk-rock; instead, it is softer, gentler, and more pop-oriented."
Although this constant labelling irks me, and sometimes music doesn't slip into neat catagories, and given this is all I know about folk-pop, it would seem some Beatles For Sales songs fit nicely into the second defination, so is not untypical of the music of the day.