A Welsh form an Awdl Gywydd:
In summary:
• Four lines
• Seven syllables per line
• The final syllable of the first and third lines rhyme with the 3rd 5th syllable of the following lines
• 2nd & 4th lines rhyme.
Useful Weblinks:
https://www.writersdigest.com/write-better-poetry/awdl-gywydd-poetic-forms
https://allpoetry.com/list/76449-Welsh-form–Awdl-gywydd
This one is a bugger. I’ve tried it.