The toad here doesn’t look particularly venomous, but I’m taking no chance on warts. This short (0:24) video is from last September:
Did the toad sit there long enough to shade the grass and keep it from growing, did it find a bare spot there already and decide to sit in it for some reason (black soil=warmth?), or did the toad excrete something the grass doesn’t like, maybe acid? (Lawns like alkalai.)
I walked away for an instant and the toad was back in the same spot again. Would the kids find it there and bother it? I stood there looking at the toad as it flared its nostrils at me. Finally it hopped off and found a hiding place. Today the toad is gone completely. Hopefully I made it nervous enough for it to survive another summer.
MacBeths’ witches had a toad around their caldron, but I had to look it up.
MacBeth Act IV, Scene 1, 6-11:
Toad, that under cold stone
Days and nights has thirty-one
Swelter’d venom sleeping got,
Boil thou first i’ the charmed pot.
Double, double toil and trouble;
Fire burn, and caldron bubble.