Wikipedia calls it Stone skipping.
There is also a list of translations, for English it mentions: "skipping stones" or "skipping rocks" (North America), "stone skimming" or "ducks and drakes" (Britain), "stone skiffing" (Ireland)[8]
- "skipping stones" or "skipping rocks" (North America),
- "stone skimming" or "ducks and drakes" (Britain)
- "stone skiffing" (Ireland)