SP is aware of the issue of the Fire Titan not producing food. The fix will be released in a day or so. Once it is released he will produce food in 6 hour increments. Also, those who purchased him will be compensated food. . I'm not sure how much so please don't ask. Also, I have no information on how we will collect the food once he is fixed. I assume it will be like the useless greenhouse.
EDIT: I received confirmation that the food production bug is fixed. The food will be ready every 6 hours, when it is ready you will see a food icon on Titan like you do on the greenhouse.