This frog-themed activity targets auditory discrimination of plurals (/s/ and /z/) and past tense (/t/ and /d/) at the word and sentence level. Each card contains two sentences which differ only by a plural or past tense marker (pages 5 to 18). Students must listen as the clinician says one of the sentences on the card and choose which sentence was said. If they are correct, they choose a point card (pages 2, 3) that matches the frog on their stimulus card. Points can be tallied for friendly competition (page 4). Data collection sheet included.