ANY breed can have a frizzled bird (and is a recognised variety for EVERY recognised breed by both APA and ABA). It simply means that the feathers are curled. All other features must meet the breed standard.
A frizzled silkie has silkie feathering that is also curled. This is NOT a sizzle; it is a frizzled silkie..
A sizzle has EVERY feature of a silkie EXCEPT for silkie feathering; a sizzle does NOT have silkie feathers. It DOES have curled feathers.
Priscilla is a sizzle. George and the unnamed white are frizzled silkies.
I can't tell whether the chicks have silkied feathers or not.