sannĭo, ōnis, m. [sanna],
one who makes mimicking grimaces , a buffoon (cf. scurra), Cic. de Or. 2, 61, 251; id. Fam. 9, 16, 10; Amm. 14, 6, 16.
sanniō ōnis, m sanna, one who mimics in mockery, a harlequin, buffoon . ...
An Elementary Latin Dictionary