In Piazza della Minerva, you will find a very cute elephant. This elephant is the base for an Egyptian obelisk. The Roman name for this statue is "Pulcino della Minerva". The statue is located in front of the Basilica di Santa Maria sopra Minerva and behind the Pantheon.
In Piazza Mattei, you will find the turtle fountain. The proper name however is the Tortoise Fountain or the Fontana delle Tartarughe.