"Folk" songs in 3/4 time seem to me to be much more common in US "folk" than in old-world "folk;" but that may just be my lack of familiarity with the other worldly.

It could be noted that 3/4 time in which the "notes" are all triplet-eighths is more readily notated as 9/8, which is quite characterstic of the "Slip Jig," for which there are immense numbers of old-world examples. These are, however, mostly performed as tunes (instrumentals to dance to?) than as songs (lyrics for singing?) - I think(?).

In the US, the uke was popularized as a "Hawaiian instrument" and investigation of tunes/songs written for it in that genre might find a more "natural fit" to the instrument that would make for easier playing until some experience is gained - especially if starting with "traditionsl tunings," although more versatile applications of the instrument have allowed it to intrude almost everywhere to some extent.

I'm not aware that the uke existed in the era when "American Folkl Music" mostly appeared, although alternate tunings do seem to permit playing just about anything.

Those who actually know something of the things I'm babbling about will of course recognize that I'm not a member of their group(s) and perhaps they will be better equipped to expand on and to explain what they think I might think I'm talking about ... (?).

John