This boss is found only in the 3DS version(s) of Terraria.
Turkor the Ungrateful is a Mobile version-exclusive boss that can be summoned only during the Thanksgiving season. Its body appears to be a cooked turkey on a plate, and its head is attached by a long, flexible spine. The head must be destroyed first, otherwise the body will only take 1 damage per hit. Once the head is destroyed, the body is vulnerable to attacks for 25 seconds, after which more heads grow. Killing only the heads is one of the best ways to make money on the Mobile version, as the coins drop upon killing the heads, not the body itself.
The head will try to peck at you and can move through blocks. Its body does high damage on contact, but does not move.
Once you destroy the first head you will have 25 seconds to hit the body. (Attacking the body before the head(s) are dead will only do 1 damage.)
After the 25 seconds are up, it will regrow 2 heads. After killing those, you will have another 25 seconds to attack the body. Then it will grow 3 heads, and you will have another 25 seconds to hit the body. It will continue to grow 3 heads until defeated. A fast way to kill him is to use a high damage high speed melee weapon on the heads then use the mana flower with the magical harp on the body.