Drummer Doge (unofficial name) is an enemy that appears in Summer Diary Event.
Has very slow attack speed, and negligible damage, but can stall your team for a long time with its long range and freeze ability. Still, unless you're a level 1 Cat, you really have nothing to fear. Awakened Bahamut can get the job done fast.
Time between attacks
300 000 HP
1800 (Area Attack)
Stop the movement of all Cat Units for 30f (100%)
It's probably a Balaluga enemy counterpart: Uber range, very low attack power and long time between attacks.