Final answer:
Yes, the sentence contains a misplaced modifier, which makes it sound as though the children are groaning on rusty springs instead of the trampoline.
Step-by-step explanation:
The sentence 'Groaning on rusty springs, the trampoline tossed with children like clothes in a dryer' does indeed contain a misplaced modifier. The phrase 'Groaning on rusty springs' is intended to modify the word 'trampoline', suggesting that the trampoline is making a groaning sound due to rusty springs as it is tossed with children. However, the way the sentence is structured makes it sound as if the children are groaning on the rusty springs, which creates confusion.