Plants that behave as a Xerophyte in one season and as hydrophyte in another season is known as :

Plants that exhibit xerophytic characteristics in one season and hydrophytic characteristics in another are known as Tropophytes. This term specifically refers to plants adapted to environments with alternating wet and dry seasons, such as the savanna or monsoon climates [2]. During the wet season, they behave like hydrophytes or mesophytes to maximize growth, while in the dry season, they adopt xerophytic traits—such as shedding leaves (deciduous nature) or entering dormancy—to conserve water and survive drought. In contrast, Saprophytes are organisms that feed on dead organic matter, and Heliophytes (often confused with heliotrophytes) are sun-loving plants. Tropophytes are common in tropical deciduous forests and grasslands where the hydrological cycle and water availability fluctuate significantly throughout the year [2].

Sources

1. [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 17: The Savanna or Sudan Climate > Natural Vegetation > p. 167