Rammus taunt does not work on Jungle Creeps.

Walk up to your raptors. Taunt the big one. Do nothing else. There's no fight. The raptors arent taunted.

Why is this an issue?

Rammus' W and E combination gives the best stat buff when you cast W when the E is about to expire. This gives the maximum amount of Bonus Attack Speed. W can not be activated after E until Rammus completely resets his animation. If W is activated before E, then you want your target to attack immediately to get the most out of your thorns.

But if you walk into a jungle camp, and want the thorns > attack speed, you lose thorns potential unless you actually hit the camp creeps with something else first.

It's something a player can learn and work around, but it's completely bugged. Rammus is supposed to taunt any champion or monster he hits with E. If Rammus Taunts before attacking while W is active, he loses damage because half the taunt duration is wasted, making his thorns deliver no damage for the time that the creeps should have been taunted.

I use Raptors as an example because Raptors and Gromp are the ones that really hurt this mechanic. Their Attack Speed would proc at least 2 additional if they were to retaliate to the taunt instead of the first attack.