My kids are younger (5, 4, 4) but we have similar riddles in AAR pre-level 1, although they're done orally. My twins can handle them no problem, but my 5yo cannot. He does, however, get them correct more often if I reword them for him without the I pronoun.
"This is something that is green or brown. It lives near the water, and likes to sit on lily pads. It says ribbit. It is a fr____."
With the "I" statements, he can't remove himself from the answers.