What are "tadpoles on toast?"

The Wikipedia article on the ill-fated King Edward VIII says this:

The reference link goes to a citation from a book, not a link that I can read. Googling “tadpoles on toast” does not bring up an answer.

What on earth is meant by this? Did he literally make tadpoles on toast? That’s…disgusting.

Hey, they’re kids, it’s certainly possible. The question is, did he eat them? That was a pretty plum job, after all.

It is like Mexican Halloween, with a different finishing move.

…a few of my favorite things…

Per this newspaper article it looks like it might have been - the French teacher apparently told them that frog legs were yummy, so perhaps they were “inspired.”