The toddaid is a Welsh poetic form of quatrains (or four-line stanzas).
Guidelines:
Comprised of quatrains (or four-line stanzas).
Lines one and three have 10 syllables; lines two and four have nine syllables.
Lines two and four end rhyme.
A syllable near the end of line one rhymes with a syllable in the middle of line two.
A syllable near the end of line three rhymes with a syllable in the middle of line four.
Note on length: Toddaid can be one stanza or multiple stanzas.
Thankyou to Writers Digest for the above information.
Helpful Links
https://www.writersdigest.com/write-better-poetry/toddaid-poetic-forms
https://www.angelfire.com/art/formsofpoetry/agamemmnon’s.sanctuary.irishforms.toddaid.html
The Wombwell Rainbow 