How did praiseworthy and jack help monsieur gaunt azaria Jones in by the great horn spoon?

You're likely thinking of the book "The Great Gilly Hopkins" by Katherine Paterson, not "By the Great Horn Spoon."

In "The Great Gilly Hopkins," Gilly, a precocious and manipulative foster child, comes to live with the kind but timid William Ernest Hopkins and his daughter, the angelic and innocent, Maime.

Praiseworthy and Jack are not characters in the story, but rather two of the many "terrible" things Gilly uses to describe William Ernest. She calls him a "praiseworthy, pitiful, put-upon, pathetic, poor, paltry, puny little man with a jackass name like William Ernest Hopkins."

Gilly uses these words to deride William Ernest, highlighting his perceived weakness and lack of sophistication, but in reality, William Ernest is a genuinely good and caring man who simply wants to be loved and accepted.

The book doesn't depict any help given by praiseworthy or jack to Monsieur Gaunt Azaria Jones, as this character doesn't exist in the story.

Perhaps you're thinking of a different book altogether? Please let me know if there's anything else you'd like to know about "The Great Gilly Hopkins."