As far as frogs go; with respect to frogs. Could also mean "I don't know what the fuck I'm talking about."
Frogwise is a term coined by the great, prophetic genius with a head like a fucking orange, Karl Pilkington. Sometimes written as two words ("frog wise").
Karl: It was the smallest thing I've ever seen--frogwise... I thought it were a spider, but when I went to pick it up it ribbeted.