Frogs and turtles are not being caught, nor are their appropriate models spawning.

Tried vanilla and Aquaculture rods all types. Have fished enough to break an iron rod. Tried different biomes, day and night.

Cannot locate code to change spawn frequency in config (complete config below). Please advise.

["basic options"]
#Enable fish mob spawning? Weight & biomes can be modified in the Aquaculture fish loot table
"Enable fish spawning?" = true
"Enable weight for fish? Useful for fishing competitions" = false
"Should fish be added as compostables for the composter/worm farm? (Based on fish, or weight if enabled)" = true
"Enable debug mode? (Enables additional logging)" = false

["neptunium options"]
"Enable recipes for Neptunium items?" = true
"Enable recipes for Neptunium armor?" = true
#Should Neptune's bounty be added as fishing loot? Very rare.
"Add Neptune's Bounty as loot?" = true

["spawn options"]

["spawn options".box_turtle]
	#Range: 0 ~ 64
	min = 1
	#Range: 0 ~ 64
	max = 2
	#Range: 0 ~ 100
	weight = 7
	include = ["SWAMP"]
	exclude = [""]

["spawn options".arrau_turtle]
	#Range: 0 ~ 64
	min = 1
	#Range: 0 ~ 64
	max = 2
	#Range: 0 ~ 100
	weight = 4
	include = ["JUNGLE"]
	exclude = [""]

["spawn options".starshell_turtle]
	#Range: 0 ~ 64
	min = 1
	#Range: 0 ~ 64
	max = 2
	#Range: 0 ~ 100
	weight = 5
	include = ["TWILIGHT"]
	exclude = [""]

Increase the weight for the Box Turtle (Only Swamp biomes) or Arrau Turtle (Only Jungle biomes) to make the mobs spawn. You're probably just fishing in the wrong biomes.
Also, that's not code - that's from the config.

Also please do not open new issues, Github is not for support it's for bug reports, that's more for our Discord (Link on the CurseForge page.