A rideable frog and a spitting magma cube one for the basalt deltas

Since basalt deltas is least abundant biome of the nether(the other ones have food, ender pearls, soul enchantment), a great vanilla’ish idea to enrich this biome is by giving it a new challenging and rewarding mob:

Challenge:
A frog(1.5 blocks tall) immune to lava who can swallow magma cubes(small and maybe middle size) and spit them on the player dealing great knockback and some damage, it can also attack the player with it’s tongue and pull him a bit as a smaller range attack. In both cases there is a danger of falling in lava, which the player can overcome with netherite armor by it’s immunity to knockback and lava damage.

Reward:
A rideable frog with great jump(maybe immune to lava) with minimum fall damage which is useful for mountainous terrain and many others such as basalt deltas. I also think that this mob should be very hard to get, for example after damaging the hostile mob above a lot, the player should throw at him weakness potion and feed him enchanted golden apple or I would prefer a “netherite fruit” giving netherite another use. Another example is after beating the mob above the player will get a small unique frog which he should raise and feed it with rare food to become an adult rideable frog.