Via the aptly-named TRIBUTOaZAPPA, Motherly Love en español. If I'm reading it right, the group performing it is called Los Huespedes Felices.
Apparently there's a whole series of Spanish Zappa tribute albums at halloffame.es. My Spanish is embarrassingly bad for someone who's spent his whole life in Arizona, so I don't know how easy they are to come by in los estados unidos (in fact my Spanish is so bad I had to look that up; I almost put "estadios unidad"), but I think I might have to look into it later.