Grover's Day at the Beach

Grover is one of the best vehicles in children's publishing for making learning feel like play, and the narrative counting frame — finding twelve objects as the day unfolds — is more memorable than a simple counting drill. Out-of-print status is a real barrier, and there's almost no critical review record, but the Sesame Street brand carries genuine trust with educators and parents. Worth tracking down through a used-book seller if you have a preschooler working on counting.