Be careful what you wish for...

[The Elf-warrior]

I wish that instead of Wargs, the Orcs of the White Hand were given large frogs to ride and meet the Rohirrim.

Your wish is granted. The Rohirrim quickly learn how to dodge them but they also learn that their blood is extremely poisonous. Aragorn discovers by accident that really yucky vegetable soup is a good antidote to the poison. Because Eowyn was appointed Chief Frog Poison Doctor she got to ride to war with the Rohirrim with Theoden's express approval. Grimbold was left to govern the remnant of the Rohirrim and thus got to live to old age.

I wish that Javert got to enter Middle-earth.