"Kudos" is a Greek singular.  The plural is "kudoi."  So it is just as ungrammatical to write "many kudos" as it is to write "many praise."  "Much kudos" is quite proper, however, just as "much praise" is.

In any case, to use a Greek word when there is a perfectly good native English one to do the job is a bit pretentious.

...and we all know that pretentious comes from French and Latin and is not exactly good native English.

https://www.etymonline.com/search?q=pretentious

I'm not advocating trying to restrict our vocabulary solely to words of Anglo-Saxon derivation, if that's what my point appeared to be.  "Program," "charisma," and "character" are Greek words that have developed specific meanings in English that would be hard to convey in pure Anglo-Saxon vocabulary.  I just don't think "kudos" adds any value that "praise" doesn't already convey.  Whereas you could write a whole dissertation on why we need both "charisma" and "gift" in our vocabulary.