Yes you can do 1 of 2 things
1 make a pillar pen 8x8 and 3 high and put alot of mantis females in there with at least 1 male then keep collect females then when you get more mantis and bring it back there will be an egg waiting and you collect it with a wip. make sure to build pen in the desert on a spawn point I got about 20 eggs in about 3 hours of grinding for this.
Or 2 with tamed ones make and adobe pen in the desert foundation just round the edge so the sand is exposed and place mantis inside, but the main trick is to have aircons next to each mantis. this works but still slow I get about 10 eggs in 3 hours so in total I get about 30 eggs using both methods at the same time! but for 1 to work you have to be out of render distance and it's best to make the pen where not alot of people go so not to affect this method