Inflatable Amphibian?

This puffy looking little toad was just as tiny as those in my preceding posts, but it was pudgy looking.

Back_Forty_Summer_2012_July_21_0865_frog

Nikon D5100 f/8 ISO 400 1/125s Nikkor 55-300@300mm – Summer 2012

I have speculated about it.  Could it have suffered an injury, like perhaps a sting from a wasp?  Has it the ability to puff up as some sort of self-protection mechanism?  Or is it simply a different variety of toad?  It was the only one like this I spotted, but that is the case for the tiny green and mud-colored frog from an earlier post, so it is probably not a significant fact. The toad acted pretty much like all its other minuscule cousins, so if it had sustained an injury, it did not appear to be life threatening.