I'm going to make a toad house and a toad pond (little, just large enough for it to cool down in). What can I use to paint these? It needs to be non-toxic but can stand up to outside conditions.

I'll probably be making these out of white/gray clay.

Outdoor paints that will work for the toad house and any surrounding decor on the pond feature are....Patio Paint, Plaid's Outdoor Paint, and even Plaid's FolkArt Acrylic Enamel if you want a glazed look to your surface.

Patio Paint requires no special prep and doesn't need a sealer and holds up well to the elements.

FolkArt acrylic Enamel can be baked on your pieces or air dried for 21-22 days to make it permanent. If using terra cotta you could actually bake your pieces in your oven. It's made to withstand microwaves and dishwashers so it will hold up well to the weather.

I personally still like to put a UV finish on my outside pieces to prevent the colors from fading over time. And to keep your pieces looking great for years to come, fresh sealer should be applied every year.