Frogs Again

I have a question that maybe someone can answer for me. There is this old movie, and I can't remember the name of it but I want to see it again because it's been a long time. The only scene I remember from it is this bear, and it was shot, or maybe it ate some mushrooms or something. But it was climbing up this mountain and started freaking out. It started seeing a bunch of frogs and there was blood everywhere. I think the frogs were jumping around in the blood. I was real young when I saw it and it freaked me out. It was cool. Does anyone have any idea what I'm talking about?