Folklore wrote:

In Fleet Farm this morning I saw a resin sculpture that is a boat with
a couple of frogs in it (one reading, one napping). It comes with a
lead weight on a length of fishing line to anchor in place. Lead
weights are bad for fishing because fish eat the weights that fall off
and get killed. This weight is large enough that no fish could eat
it, but I'm not sure if just having it in the water would be toxic?

You could dip it or coat the lead with a finish, which would be
non-toxic, once dry.