There are 2 waterparks in WDW. However, ever since COVID, only one park has been open while the other closed for refurbs. If you're going from May 1 onwards, you'll be at Typhoon Lagoon instead of Blizzard Beach.
At Blizzard Beach there is a place called Tike's Peak on the far northern side of the waterpark that caters to the smaller clientele.
At Typhoon Lagoon their equivalent is Ketchakiddee Creek, south of Keelhaul Falls.