Currently, yama.finance only offers GLP (mooGLP to be exact) as their collateral. The idea is that since mooGLP is a yield bearing asset, it is unlikely that the LTV to drop and liquidate your collaterals. However, keep in mind holding GLP are basically betting against GMX traders, so you might want to visit this thread before allocating exposure to this asset.

In order to borrow loans from yama.finance, you need to leverage up your colateral exposure first.
The higher the leverage, the more you can borrow. But this also means that you are closer liquidition price.

FeeGLP is a token used in the GMX protocol on the Arbitrum network. It is a representation of the fees generated by the protocol and is used to incentivize liquidity providers and other participants in the ecosystem.
When users interact with the GMX protocol, they pay transaction fees which are then collected and converted into FeeGLP tokens. These tokens can be held or traded by users, and they also entitle holders to a share of the protocol's revenue generated from trading fees.
FeeGLP is an ERC-20 token, meaning that it is compatible with the Ethereum network and can be stored in any wallet that supports ERC-20 tokens. Its value is determined by market forces and can fluctuate based on supply and demand.