I've not heard of worm
bloods, but I've heard of warm
And no, the origination of the Warmblood does not come from breeding cold and hot blooded horses. That's a common misconception.
Warmbloods are a group of middle-weight horse types and breeds, primarily originating in Europe, registered with organizations that are characterized by open studbook policy, studbook selection, and the aim of breeding for equestrian sport.
The term warmblood distinguishes these horses from both heavy draft horses ("cold bloods") and refined light saddle horses such as the Thoroughbred and Arabian ("hot bloods").
Though modern Warmbloods are descended from heavier agricultural types systematically upgraded by hotblood influence, the term does not
imply that Warmbloods are direct crosses of "cold" and "hot".
It is thought that the Warmblood type, which originated in continental Europe, descended from a landrace of wild, native proto-warmblood ancestors, and possibly trace back to a wild prototype called the Forest Horse.