I used the Little Green Frog Song to help a student articulate letter sounds and also blend some sounds together. This can be effective with students who have apraxia as well.
I have recently changed this activity so that the students can place the letter they are working on, on a lily pad at the end of the song. This also gives them the opportunity to choose the correct letter from a few choices. Another way to do this file folder is to have them put the frog on the lily pad with the correct letter.