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Description
Crawns are aquatic tentaculopods, closely related to crestheads. They can reach immense size and often resemble Earth's crocodiles in their lifestyles. Adaptions to survive and move on land for short periods are fairly common among this group, presented in almost leg-like tentacles on the second segment, large gill chambers that can be closed and ventral spines that provide grip and prevent them from slipping backwards. Albeit especially the smaller species specialise in catching aquatic prey, crawns are often ambush predators that hunt terrestrial animals moving too close to water bodies; they are not very selective about their prey and even have jaws that can move in two different modes, depending on the size and shape of their prey. Interestingly, in this group the larger females are territorial, in some causes like the imperial crawn; the males are responsible for guarding their eggs.
Pikeshrimp: This group lost its ability to survive on land and specializes in hunting smaller tentaculopods and limnic squidworms; like most crawns, it is an ambush predator.
Mudcrawn: Tends to live and breed in periodically drying out ponds and has a lung-like section in their gill-chambers. If needed, they will leave their home ponds and move to the next lake or river until the next larger rainfalls. Some species living in moister climates will leave the water for hunting small, slow land animals.

I would be very grateful if you can come up with a better name for these guys.

Description
Crawns are aquatic tentaculopods, closely related to crestheads. They can reach immense size and often resemble Earth's crocodiles in their lifestyles. Adaptions to survive and move on land for short periods are fairly common among this group, presented in almost leg-like tentacles on the second segment, large gill chambers that can be closed and ventral spines that provide grip and prevent them from slipping backwards. Albeit especially the smaller species specialise in catching aquatic prey, crawns are often ambush predators that hunt terrestrial animals moving too close to water bodies; they are not very selective about their prey and even have jaws that can move in two different modes, depending on the size and shape of their prey. Interestingly, in this group the larger females are territorial, in some causes like the imperial crawn; the males are responsible for guarding their eggs.
Pikeshrimp: This group lost its ability to survive on land and specializes in hunting smaller tentaculopods and limnic squidworms; like most crawns, it is an ambush predator.
Mudcrawn: Tends to live and breed in periodically drying out ponds and has a lung-like section in their gill-chambers. If needed, they will leave their home ponds and move to the next lake or river until the next larger rainfalls. Some species living in moister climates will leave the water for hunting small, slow land animals.

I would be very grateful if you can come up with a better name for these guys.