A Fish is a term given to an investor with a small crypto portfolio or investment. Fish are unable to manipulate the markets with their small buy/sell trades but whales on the other hand are investors with a large portfolio/investment and are capable of manipulating the price of the given crypto or market.
Polkadot

Polkadot is an open-source sharded multichain protocol that connects and secures a network of specialized blockchains, facilitating cross-chain transfer of any data or asset types, not just tokens, thereby allowing blockchains to be interoperable with each other.
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