An Awdl Gywydd poem is a poetic form found in Welsh literature. These are the rules of the form:
There are four lines per stanza
Each line contains seven syllables
The final syllable of the first and third lines rhyme with the 3rd-5th syllable of the following lines respectively
The second and fourth lines need to rhyme.
This is a link to the page which does a better job explaining it as well as has much better written examples can be found here:
Here is my attempt at two stanzas, warts and all.
Trying a new poetry form
The words swarm into their line
Can I make this poem work?
Crafting takes guesswork and time
Hope I leave you with a smile
The trial was not too bad
This Welsh poem type is strange
Where the rhymes exchange a tad