From which Harry Potter book does Ron say these quotes, "Stupid little featherly git," and, "Harry, you prat"?

Both lines are from Harry Potter and the Goblet of Fire (2005)
A "prat" is a slang term for a fool; also for a person's backside.

"Harry, you prat," said Ron, "you didn't take that song thing seriously, did you?"
- Ron to Harry (GF26)

http://www.hp-lexicon.org/help/british/sb-p.html
http://www.hp-lexicon.org/about/books/gf/rg-gf26.html
elfwood.com/fanq/a/n/annie778/stupid_little_feathery_git.jpg.html [no longer exists]

From "The Goblet of Fire" - GoF pg. 405: Pigwidgeon returns with a message from Sirius.

...a group of third year girls paused and said, “Oh look at the weeny owl! Isn’t he cute?”
“Stupid feathery little git!” Ron hissed, hurrying up the stairs and snatching up Pigwidgeon. “You bring letters to the addressee! You don’t hang around showing off!”
Pigwidgeon hooted happily, his head protruding over Ron’s fist. The third year girls all looked very shocked.
“Clear off!” Ron snapped at them, waving the fist holding Pigwidgeon...
Ron has an owl but he doesn’t seem to appreciate it. Maybe Pig’s not as good as Hedwig. Would Ron appreciate a girlfriend any more? He got bored with Lavender pretty fast and Hermione has a tendency to run and hug Harry.

https://m.tululu.org/bread_13069_239.xhtml

"“Harry, you prat,” said Ron, “you didn’t take that song thing seriously, did you? Dumbledore wouldn’t have let any of us drown! […] I hope you didn’t waste time down there acting the hero!”11"
http://www.the-leaky-cauldron.org/features/essays/issue2/SecretsOfNumberTwelve