It could be a later Amplifier. Hard to tell though from the photo. Some closer, more detailed photos of the shock area and the rear linkage areas would be helpful. Looks like it may have a custom paintjob if it is a Mongoose.
Also, if you search the forum for Mongoose and/or Amplifier you should find some photos of some to compare yours to.
Need: McMahon brake for roller cam mounts, Mountain Goat fork.