The Wikipedia article for "Señor Don Gato" credits
Margaret Marks with the singable English translation.
I always wondered whose English words I was singing
as I remember this from the classroom of my elementary school.

When I Google Margaret Marks's name,
I can discover nothing about the person.
However she seems to have written singable English translations
for many a popular tune with origins outside of English,
especially for Silver Burdett music books
for elementary school classrooms.