Hi! Sadly you can’t get insects or bugs from other players. You have to catch them yourself. However, if you go on a Mystery Island Tour you can create an island that scorpions are more likely to spawn on.
Other than scorpion island, the best island to convert is bamboo island. Break all the rocks, pick all the flowers, and cut down all the coconut trees less you are farming for the beetles.
unfortunately people cant give bugs to others, or fish
creating a scorpion island is the best bet however, ive noticed that ever since the fireflies have been introduced into the game, the game wont spawn as many scorpions on the mystery islands as they did when the fireflies werent around. kind of stinks that whenever the game gives you a decent supply of something they take it away from us quickly BUT! you can time travel in order to get them. the game actually rewards you for time traveling as well. you will get a bunch of different island recipes as well as a gaggle of flowers, and if you travel often and plant the money trees you can make an insane amount of cash.