Logs appear as the starting platform in the creek levels, where Crash will first warp there. It only appears at the beginning of the level.
Logs play a key role as platforms again in the game, where they start out as hallow, leafless trees, but if the player activates a Nitro or TNT explosion it will fall over, creating a bridge for Crash. This is one of the mechanics of Doc Amok in Totem Hokum, but only at the beginning, to created a bridge for Crash and Cortex.
They reprise the same role they did in the original Crash Bandicoot.