Cruising through the file Proto.xml today, I noticed what seem to be two more hidden units, in addition to the Tommynator (Monster Truck) and Mediocre Bombard. One is called the "Flying Purple Tapir," whereas the other unit seems to be an alternate, blue, version of the Tommynator, there are a few other differences as well, such as how it applies damage. If anyone would care to figure out the codes for these, it would be awesome. Thanks. By the way, they are near the bottom of the file if you want to look at them. EDIT: Actually I think the tapir is the projectile of the mediocre bombard now that I think of it.
For the monster truck press enter then type tuck tuck tuck and press enter again and you will hear and enigine sound look on town centre and there is the monster truck which basiclly means you cannont lose.The mediocre bombard -press enter then type you gotta make do with what ya got then press enter you will here the soubd of forward! then look at your town centre and there will be a what appaers to be a great bombard but is not. and there you have it the two units