A group of toads is collectively called a knot.
Why it is true
This collective term reflects the behavior of toads clustering tightly together, especially during hibernation or in water puddles.
Source: Zoology
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.