"wild as a marsh-tigget in May"

An example of Stella Gibbons making up the name of a bird or insect (other examples in the text are eft-flies, finch-fly and lin-tit). As with her made-up names of flowers and so on, she manages to choose names which sound like the common names of birds and insects in use in English. For example, there is a real bird called the marsh tit.

Marsh tit - not to be confused with the 'marsh-tigget'!
Creative Commons Attribution Share Alike Marsh tit - not to be confused with the 'marsh-tigget'! - Credit: Dave Hamster, Wikimedia Commons