I wonder if it's from anywhere in the Spanish-speaking world: first the song only comes up on English speaking sites, then "Spanish-speaking" hands usually "say" plas plas plas not cla/clap cla/clap cla/clap, then "pies" is stressed on the "e" not the "i" so a Spanish speaker would avoid stressing it on "i" and would insert a one syllable word such as "y" and say "y mis pies" or something like that instead so that the beat fall on the stressed vowel. I don't say that the stress falling on the wrong vowel never happens (Cf "Mariá, Mariá, ven acá corriendó el chocolatilló se lo está llevandó..." in Hacia Belén va una burra but it's rare. It looks like those songs teachers make up to teach the kids the body parts or whatever else in their own language when they're very young or in a foreign language when they're a little older. Well, when I say "teachers", it may be anyone involved with children or children "business". I'd add that the song isn't in any of the Spanish songbooks for children I came across -even it's no proof of anything.