The function of shrimp truffles in the game "Terriaria" is to summon mounts.

The Shrimp Truffle in Terraria is a mount summoning item obtained by opening Duke Fishron's treasure bag in expert mode. After use, it can summon a small mount similar to Duke Fishron. This mount can fly infinitely and move quickly through water.

Features of the mount summoned by Shrimp Truffle:

When the player drives the cute Fishron into the liquid, he will receive an additional speed bonus (the horizontal speed is increased to 82mph) and the player will receive a bonus of 15 % of attack power. These effects continue for 6 seconds after exiting a body of water, but the horizontal speed bonus is reduced to 66mph/hour. The bonus effect will also trigger when the player's health drops below 50% (66mph/hour).

Its eyes indicate the duration of the bonus effect: when the eyes stop glowing, the effect disappears. The color of the water affects the color of the eyes of the Cute Fishron. For example, if the water in a desert environment is yellow, the eyes of the Cute Fishron will glow yellow. The same applies to sacred and other terrains.

When in contact with the ground (on top of any block), the Cute Fishron's movement speed is greatly reduced to 5 mph, so it is best not to stay in tight spaces. You will also get a speed bonus when it rains.