How about the MiniGiant Giant Mini's, and have them all be human models?

(cuz then they'd be "mini-giants" or "giant-mini's" compared to dwarves, har har

)
Or, perhaps, the Minigiant Rockets? As a slight allusion to "Jets", but still being Warhammery enough. (But, I don't know how Dwarf-y enough it'd feel like).
Of your suggested names, I kinda like Anvils more, but it feels too... stagnant? or static? I dunno, it just doesn't feel like a pumped up/exciting team, more like a team that just go along and take the blows and keep going... Which, in Blood Bowl, might not actually be a bad thing

Going with "Titans" I feel would conflict with your Mini*Giant* title, and the Tennessee Titans are a different color-scheme

Another name that just popped to mind: perhaps the Minigiant Thunders? or Thunderers? or something like that?
Hopefully my ramblings help you out! I've never had a chance to play real Blood Bowl (only the cheaty-CPU version that makes me want to break my monitor in rage lol... I'm sure it's more fun in reality), so I don't have much knowledge in the game's fluff-logistics.

34 Gnobs! Over 3 Packs of Trappers! Woot!
Gibblet, Nibblet, Crunchybit, and Snorti! (For rules clarification on dwarf Snorri banner )
New book WLD: 21/11/3 - Got trounced by one of the "Khaine" elf armies... Stupid new rules...