By size, I might back the Jotunheim beast if it's the Rancor in the photo. It was significantly larger than that Rancor. In fact, the Frost Beast is likely a lot larger than even the KotoR Rancor (or was it KotoR 2? The one you put the mines in the bone pile for); which was bigger than the one in that pic.

I mean, its only anti-feat is getting killed by Thor at full speed.

Thanks for reading,

Floopay