stranger danger
A hink-pink.
strange change
If it were a Hink-Pink, it could be "a thick brick." Actually, the question is about Hink-Pink according to the original source for the question which is a book for gifted students. The section of the book asks about both hink pink and hinky pinky, and the question is in the hink-pink category on the page.
Fine Nine.
swift lift
Odder trouble could be "stranger danger" while hink pink could be "clue glue."
Double trouble is a hink-pink or rhyming word pair for the riddle "two dangers."
Someone who offers trouble could be a "danger arranger" but since the "f" is right next to the "d" on the keyboard, there is a good chance you meant to ask about "odder trouble." That's stranger danger.
little riddle
bread spread
blue glue
A hink-pink.
dog log
bag tag
double trouble
spring thing, summer drummer
big pig