I like the champion, and parts of it reminded me of a tank champion I have been working on, so I wanted to reply. I do believe the numbers should be lowered on many of his abilities as they feel like they provide too high. I do believe 250 armor and magic resist with 5000 health is too high. No other champion could get near those stats.
I do like Food Frenzies attach (that is what reminded me of the champion I am working on). I do like the taking damage while moving, but with the slows I don't think it encourages the target to move enough. I like the idea of the enemy champion making having to decide between two bad options; do I run and take damage, or do I stay and fight against the odds. With a slow and damage there isn't much incentive to even try to get away.
His Sticky and Sweaty Breath's active, Worminidae Skin, and Deadly Jaw together are what I think bother me the most. They go so well together that they are almost a big sign saying don't hit me and ignore me. If you attack him you lose attack speed, have to go through a lot of health and armor, and fuel is big spell that can now one shot you. As the tank, I think he needs some type of threat that makes you want to hit him.
One example I thought could be to reverse Deadly Jaw. When activated Trodoom gains increased adrenaline. Every .5 seconds he receives an adrenaline stack. You deal a flat damage amount, an amount per stack, and a percent of health as damage when activated again. The catch is you lose stacks every time you are hit by an auto attack. You still have the high damage ultimate, but if they keep your stacks low it means you are doing your job and the enemy champions are attacking you.