On the left: horned toad--Phrynosoma sp. of the southwest U. S.
On the right: thorny devil--Moloch horridus, Australia.
These are two analogues. Both live in semi-arid to arid conditions, both have enormous stomachs to contain large numbers of ants. Because ants are so small they are low in nutrition, because a large part of the body is the chitinous exoskeleton. Both are externally similar with protective horns.
Thorny devil
Horned toad