It's called 'I Tickled Her Under Her Chin', by T Texas Tyler. It came out in 1955. Just listen to the lyrics and the women's laughter interspersed throughout the song, it's so good: youtu.be/RQtd5Cl_zSE
This is a nice little ditty as well:
"Just tickle my feet and I'll smile again".
Quite often I've hear people say they love their back being tickled... I think the reference to feet here is for tickling in a similar context. Gently ticklestroke.
There is no laughter, but it's a cute song.
youtu.be/n2RlYBhAnkY