Cannot Target Frozen is an attack behavior characterized by not being able to target Frozen Bloons. It is part of the attack interactions family. While there are towers that cannot pop Frozen with their attacks, very few are unable to target Frozen.
Cannot Target Frozen is represented on Bloons Wiki as 
, the upgrade portrait for Druid of the Jungle in Bloons TD 6, as it lost its ability to use its instakill vine attack against Frozen Bloons without Frozen popping power, beginning with version 38.0. Cannot Target Frozen refers to the inability to target frozen, not pop frozen.
The earliest example of Cannot Target Frozen is Beekeeper (Pro) in BTD5, as its bees ignore bloons that are frozen. In BTD6, the 
Sharp damage type icicles produced on bloons from Icicles and Icicle Impale cannot target frozen, as to prevent them from being wasted on nearby frozen bloons.
