Just a tuck stitch, but it looks like a bubble on the knit side. Can be knit plain as well. No pattern, I was just going along but in the end it was just a tad too tall.
by AhiluArts All 'bout Crochet
by Caring Caps Inc.
by Meladora's Creations for Crochet
by Amanda Crochets
by Roberta Rose Kelley
by Bronislava Slagle
by 1001knits